HD Pentax-DA 10-17mm F/3.5-4.5 ED Fisheye

Fisheye lens • Digital era

HD High Definition Coating is applied to the surface of lens elements. It boosts light transmission, ensures sharp and high contrast images, minimizes ghosting and flares.
DA Autofocus lens optimized for Pentax digital SLR cameras.
ED The lens incorporates low dispersion elements.
FISHEYE An ultra-wide angle lens with strong uncorrected barrel distortion and extreme 180-degree angle of view.

Model history ⋅ モデル履歴

Pentax *ist D

APS-C AF digital SLR camera

Announced ⋅ 発表:February ⋅ 2月 2003
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax *ist DS

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2004
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax *ist DL

APS-C AF digital SLR camera

Announced ⋅ 発表:June ⋅ 六月 2005
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax *ist DS2

APS-C AF digital SLR camera

Announced ⋅ 発表:August ⋅ 8月 2005
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax *ist DL2

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Samsung GX-1S

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Samsung GX-1L

APS-C AF digital SLR camera

Announced ⋅ 発表:February ⋅ 2月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax K100D

APS-C AF digital SLR camera

Announced ⋅ 発表:May ⋅ 5月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K110D

APS-C AF digital SLR camera

Announced ⋅ 発表:May ⋅ 5月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:-

Pentax K10D

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3872 × 2592 - 10 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Samsung GX-10

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2006
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3872 × 2592 - 10 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K100D Super

APS-C AF digital SLR camera

Announced ⋅ 発表:June ⋅ 六月 2007
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3008 × 2008 - 6 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K200D

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2008
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3872 × 2592 - 10 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K20D

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2008
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.4 × 15.6mm - 1.54x
Resolution ⋅ 解像度:4672 × 3104 - 15 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Samsung GX-20

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2008
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.4 × 15.6mm - 1.54x
Resolution ⋅ 解像度:4688 × 3120 - 15 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-m

APS-C AF digital SLR camera

Also known as ⋅ としても知られている:Pentax K2000
Announced ⋅ 発表:September ⋅ 9月 2008
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.7mm - 1.53x
Resolution ⋅ 解像度:3872 × 2592 - 10 MP
Sensor type ⋅ センサータイプ:CCD
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-7

APS-C AF digital SLR camera

Announced ⋅ 発表:May ⋅ 5月 2009
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.4 × 15.6mm - 1.54x
Resolution ⋅ 解像度:4672 × 3104 - 15 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-x

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2009
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.6 × 15.8mm - 1.52x
Resolution ⋅ 解像度:4288 × 2848 - 12 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-5

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2010
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-r

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2010
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.6 × 15.8mm - 1.52x
Resolution ⋅ 解像度:4288 × 2848 - 12 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-30

APS-C AF digital SLR camera

Announced ⋅ 発表:May ⋅ 5月 2012
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-5 II

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2012
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-5 IIs

APS-C AF digital SLR camera

Announced ⋅ 発表:September ⋅ 9月 2012
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-50

APS-C AF digital SLR camera

Announced ⋅ 発表:June ⋅ 六月 2013
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-500

APS-C AF digital SLR camera

Announced ⋅ 発表:June ⋅ 六月 2013
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.7 × 15.7mm - 1.52x
Resolution ⋅ 解像度:4928 × 3264 - 16 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-3

APS-C AF digital SLR camera

Announced ⋅ 発表:October ⋅ 10月 2013
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:6016 × 4000 - 24 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-S1

APS-C AF digital SLR camera

Announced ⋅ 発表:August ⋅ 8月 2014
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:5472 × 3648 - 20 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-S2

APS-C AF digital SLR camera

Announced ⋅ 発表:February ⋅ 2月 2015
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:5472 × 3648 - 20 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-3 II

APS-C AF digital SLR camera

Announced ⋅ 発表:April ⋅ 4月 2015
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:6016 × 4000 - 24 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-70

APS-C AF digital SLR camera

Announced ⋅ 発表:June ⋅ 六月 2016
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:6000 × 4000 - 24 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax KP

APS-C AF digital SLR camera

Announced ⋅ 発表:January ⋅ 1月 2017
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.5 × 15.6mm - 1.53x
Resolution ⋅ 解像度:6016 × 4000 - 24 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Pentax K-3 III

APS-C AF digital SLR camera

Announced ⋅ 発表:March ⋅ 行進 2021
Mount ⋅ マウント:Pentax K
Format ⋅ フォーマット:23.3 × 15.5mm - 1.55x
Resolution ⋅ 解像度:6192 × 4128 - 26 MP
Sensor type ⋅ センサータイプ:CMOS
Image stabilizer ⋅ 手ぶれ補正:Yes ⋅ はい

Designed for ⋅ のために設計された

Click to expand or collapse section(s)

Features highlight ⋅ 機能のハイライト

APS-C
Extreme AoV @ 10-17mm
1 ED
IF
Body AF
QFS
SP

Specification ⋅ 仕様

Production details ⋅ 制作内容
Announced ⋅ 発表:July ⋅ 7月 2019
Production status ⋅ 生産状況:In production ⋅ 生産中
Production type ⋅ 生産タイプ:Mass production ⋅ 大量生産
Original name ⋅ 元の名前:HD PENTAX-DA FISH-EYE 1:3.5-4.5 10-17mm ED
Optical design ⋅ 光学設計
Focal length range ⋅ 焦点距離の範囲:10mm - 17mm
Speed range ⋅ 速度範囲:F/3.5 @ 10mm - F/4.5 @ 17mm
Maximum format ⋅ 最大フォーマット:APS-C
Mount ⋅ マウント:Pentax K
Lens construction ⋅ レンズ構造:10 elements ⋅ 要素 - 8 groups ⋅ グループ
1 ED
Convex protruding front element ⋅ 凸状に突き出たフロントエレメント
Diaphragm mechanism ⋅ ダイヤフラムメカニズム
Diaphragm control system ⋅ ダイヤフラム制御システム:Mechanical ⋅ 機械的
Number of blades ⋅ 絞り羽根の数:6
Zooming ⋅ ズーミング
Zoom type ⋅ ズームタイプ:Rotary ⋅ ロータリー
Zooming method ⋅ ズーム方法:Extends while zooming ⋅ ズームしながら伸びる
Focusing ⋅ フォーカシング
Closest focusing distance ⋅ 最短撮影距離:0.14m
Closest working distance ⋅ 最短作動距離:0.025m
Maximum magnification ratio ⋅ 最大倍率:1:2.56 @ 17mm at the closest focusing distance ⋅ 最寄りの距離で
Focusing method ⋅ フォーカシング方法:Internal focusing (IF) ⋅ 内部フォーカシング
Focusing modes ⋅ フォーカシングモード:Autofocus, manual focus ⋅ オートフォーカス、マニュアルフォーカス
Manual focus control ⋅ マニュアルフォーカス制御:Focusing ring ⋅ フォーカシングリング
Autofocus motor ⋅ オートフォーカスモーター:In-camera motor
Focus mode selector ⋅ フォーカスモードセレクター:None; focusing mode is set from the camera
Quick-Shift Focus System (QFS):Yes ⋅ はい
Shake Reduction (SR)
Built-in SR:-
Physical characteristics ⋅ 体格的特徴
Weight ⋅ 重量:317g
Maximum diameter x Length ⋅ 最大直径x長さ:⌀67.5×70mm
Weather sealing ⋅ ウェザーシーリング:-
Super Protect (SP) coating:Front element ⋅ フロントエレメント
Accessories ⋅ 付属品
Filters ⋅ フィルタ:Removable front filters are not accepted ⋅ 取り外し可能なフロントフィルターは使用できません
Lens hood ⋅ レンズフード:Bayonet-type ⋅ バヨネットタイプ PH-RBA (petal-shaped ⋅ 花びらの形)

Manufacturer description #1

The first-generation fish-eye zoom lens — the smc PENTAX-F Fish-eye Zoom 17-28mm F3.5-4.5 — left one problem to be solved: its minimum focusing distance of 0.45 meters made it difficult to close in on the subject. Since it used a front-group-extension focusing mechanism, the zoom effect during focusing operation made the angle of view wider, resulting in vignetting in close-up photography.

In the development of the smc PENTAX-DA FISH-EYE 10-17mm F3.5-4.5ED[IF], which was designed for use with APS-C-format digital SLR cameras, PENTAX aimed at shortening the minimum focusing distance — one objective left unsolved with the first-generation fish-eye zoom lens — and adopted the Inner Focus (IF) mechanism, in which the rear group of the first optical element group was shifted during focusing. This IF mechanism realized an optical system free of vignetting during close-up photography.

With a minimum focusing distance of a mere 0.14 meters, and a minimum distance of 2.5cm between the subject and the front surface of the lens, this new fish-eye zoom lens has greatly expanded the range of photographic applications.

The ability to approach the subject more closely, however, created new problems, such as dirt and scratches on the lens surface caused by the contact with the subject. To solve these, PENTAX developed a new fluorine coating to protect the lens surface. Named SP (Super Protect) Coating, it is not only repellent to water and grease and prevents dust, water drops and oil stains from adhering to the lens surface, but also makes it easy to wipe them off. First applied to the smc PENTAX-DA FISH-EYE 10-17mm F3.5-4.5ED[IF], SP Coating is also featured in the newest HD PENTAX-DA FISH-EYE 10-17mm F3.5-4.5ED.

Thanks to the application of HD Coating, the HD PENTAX-DA FISH-EYE 10-17mm F3.5-4.5ED not only delivers clearer, sharper images than its predecessor, but also assures higher imaging performance against backlight.

The exterior features a wrinkle-finished surface, with meticulous attention paid to every detail. This totally redesigned body makes it a perfect match with the latest camera bodies and other lenses.

With previous models, the lens hood was integrated into the lens barrel. With the HD PENTAX-DA FISH-EYE 10-17mm F3.5-4.5ED, however, it is designed to be removable to provide greater options in photographic expression.

Manufacturer description #2

The development of this new zoom lens was based on smc PENTAX-DA FISH-EYE10-17mmF3.5-4.5ED, while conducting a thorough review of lens coatings. The high-grade, multi-layer HD Coating has been applied to the optical elements for high-contrast images with edge-to-edge sharpness and free of flare and ghost images. The exterior has been totally redesigned to match the design of the latest PENTAX K-mount digital SLR models, and also to make its lens hood removable. When mounted on a PENTAX K-1 or PENTAX K-1 Mark II camera body, the photographer can remove the lens hood to produce nearly circular fish-eye images.

After a thorough review of lens coatings, PENTAX applied HD Coating* — PENTAX’s latest multi-layer coating — to the lens. Compared to conventional multi-layer coatings, this high-performance, multi-layer coating reduces average reflectance in the visible light range by more than 50 percent and improves light transmittance, to minimize the adverse effects of flare and ghost images even in demanding lighting conditions such as backlighting. This zoom lens also incorporates an Extra-low Dispersion (ED) glass element to effectively compensate for chromatic aberration for extra-clear, high-contrast images.

When mounted on a PENTAX digital SLR camera body, this zoom lens provides a 180-degree diagonal angle of view in the APS-C format at a focal length of 10mm to deliver eye-catching fish-eye images. Since the angle of view shifts dramatically with a slight change of focal length, the photographer can easily create visual expressions typical of an ultra-wide-angle lens, such as exaggerated perspective, deformed subjects and a pan-focus effect to capture the entire image field in focus.

While retaining the overall size of the original smc PENTAX-DA FISH-EYE10-17mmF3.5-4.5ED, this zoom lens features a totally new exterior design, similar to that of the latest DA- and D FA-series lenses. This new appearance also makes it a perfect partner for the newest K-series digital SLR models. Although it is an ultra-wide-angle zoom lens, it has been designed to be extremely compact and lightweight. The removable lens hood allows for nearly circular fish-eye images* to expand the range of photographic expressions, when mounted on a PENTAX K-1 or PENTAX K-1 Mark II camera body.

* When the lens hood is removed with the Crop Function set to FF mode, there may be vignetting and/or lowered imaging performance at the edges of the image field, because the resulting image contains elements outside the lens’s image circle.

SP (Super Protect) Coating, highly repellent to water, grease and dirt, has been applied to the lens’s front surface using a PENTAX-exclusive fluorine deposition process, making it easy to wipe off any stains such as fingerprints. This frees the photographer from worries in outdoor photography.

Other features:

  • Quick-Shift Focus System, to provide instant shift to manual-focus operation after locking the subject in focus during AF operation by pressing the shutter-release button halfway down; usable at any time during AF operation
  • A minimum focusing distance of 14 centimeters, allowing the photographer to move in as close as approximately 2.5 centimeters from the front end of the lens to the subject, for ultra-close-up photography

From the editor ⋅ 編集者から

The lens is a result of cooperation between Pentax and Tokina companies and known as the Tokina AT-X Fisheye 107 AF 10-17mm F/3.5-4.5 (IF) DX NH in the Canon EOS and Nikon F systems.

Typical application ⋅ 典型的なアプリケーション

scientific and industrial photography ⋅ 科学および産業写真

smc Pentax-DA 10-17mm F/3.5-4.5 ED [IF] Fisheye (Schneider-KREUZNACH D-Xenogon, Samsung SA)

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35mm full frame

43.27 24 36
  • Dimensions: 36 × 24mm
  • Aspect ratio: 3:2
  • Diagonal: 43.27mm

Fisheye lens

A fisheye lens is a type of ultra-wide angle lenses with extreme 180 degree angle of view. Unlike conventional wide-angle lenses, fisheyes are not corrected for distortion - strong barrel distortion is a characteristic of all lenses of such class.

Fisheye lenses are normally used for specialized purposes and unusual special effects in advertising, commercial, scientific, surveillance, meteorologic and astronomic photography, but also popular for shooting extremely wide landscapes, interiors, action sports and even funny close-up portraits.

There are two types of fisheye lenses:

Travellers' choice

Note

Among autofocus lenses designed for 35mm full-frame mirrorless cameras only. Speed of standard and telephoto lenses is taken into account.

One of the best fisheye zooms

According to lens-db.com; among lenses designed for the same maximum format and mount.

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Cannot compare the lens to itself.

Quality control issues

The manufacturer of this lens does not provide adequate quality control. If you do decide to purchase this lens, do not order it online, but choose the best copy available in the store. In any case, there may also be problems with the build quality, and warranty repairs can take months.

Image stabilizer

A technology used for reducing or even eliminating the effects of camera shake. Gyro sensors inside the lens detect camera shake and pass the data to a microcomputer. Then an image stabilization group of elements controlled by the microcomputer moves inside the lens and compensates camera shake in order to keep the image static on the imaging sensor or film.

The technology allows to increase the shutter speed by several stops and shoot handheld in such lighting conditions and at such focal lengths where without image stabilizer you have to use tripod, decrease the shutter speed and/or increase the ISO setting which can lead to blurry and noisy images.

In-camera motor

Aspherical elements

Aspherical elements (ASPH, XA, XGM) are used in wide-angle lenses for correction of distortion and in large-aperture lenses for correction of spherical aberration, astigmatism and coma, thus ensuring excellent sharpness and contrast even at fully open aperture. The effect of the aspherical element is determined by its position within the optical formula: the more the aspherical element moves away from the aperture stop, the more it influences distortion; close to the aperture stop it can be particularly used to correct spherical aberration. Aspherical element can substitute one or several regular spherical elements to achieve similar or better optical results, which allows to develop more compact and lightweight lenses.

Use of aspherical elements has its downsides: it leads to non-uniform rendering of out-of-focus highlights. This effect usually appears as "onion-like" texture of concentric rings or "wooly-like" texture and is caused by very slight defects in the surface of aspherical element. It is difficult to predict such effect, but usually it occurs when the highlights are small enough and far enough out of focus.

Low dispersion elements

Low dispersion elements (ED, LD, SD, UD etc) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture. This type of glass exhibits low refractive index, low dispersion, and exceptional partial dispersion characteristics compared to standard optical glass. Two lenses made of low dispersion glass offer almost the same performance as one fluorite lens.

Low dispersion elements

Low dispersion elements (ED, LD, SD, UD etc) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture. This type of glass exhibits low refractive index, low dispersion, and exceptional partial dispersion characteristics compared to standard optical glass. Two lenses made of low dispersion glass offer almost the same performance as one fluorite lens.

Canon's Super UD, Nikon's Super ED, Pentax' Super ED, Sigma's FLD ("F" Low Dispersion), Sony' Super ED and Tamron's XLD glasses are the highest level low dispersion glasses available with extremely high light transmission. These optical glasses have a performance equal to fluorite glass.

High-refraction low-dispersion elements

High-refraction low-dispersion elements (HLD) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture.

High Index, High Dispersion elements

High Index, High Dispersion elements (HID) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture.

Anomalous partial dispersion elements

Anomalous partial dispersion elements (AD) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture.

Fluorite elements

Synthetic fluorite elements (FL) minimize chromatic aberrations and ensure excellent sharpness and contrast even at fully open aperture. Compared with optical glass, fluorite lenses have a considerably lower refraction index, low dispersion and extraordinary partial dispersion, and high transmission of infrared and ultraviolet light. They are also significantly lighter than optical glass.

According to Nikon, fluorite easily cracks and is sensitive to temperature changes that can adversely affect focusing by altering the lens' refractive index. To avoid this, Canon, as the manufacturer most widely using fluorite in its telephoto lenses, never uses fluorite in the front and rear lens elements, and the white coating is applied to the lens barrels to reflect light and prevent the lens from overheating.

Short-wavelength refractive elements

High and specialized-dispersion elements (SR) refract light with wavelengths shorter than that of blue to achieve highly precise chromatic aberration compensation. This technology also results in smaller and lighter lenses.

Blue Spectrum Refractive Optics

Organic Blue Spectrum Refractive Optics material (BR Optics) placed between convex and concave elements made from conventional optical glass provides more efficient correction of longitudinal chromatic aberrations in comparison with conventional technology.

Diffraction elements

Diffraction elements (DO, PF) cancel chromatic aberrations at various wavelengths. This technology results in smaller and lighter lenses in comparison with traditional designs with no compromise in image quality.

High refractive index elements

High refractive index elements (HR, HRI, XR etc) minimize field curvature and spherical aberration. High refractive index element can substitute one or several regular elements to achieve similar or better optical results, which allows to develop more compact and lightweight lenses.

Apodization element

Apodization element (APD) is in fact a radial gradient filter. It practically does not change the characteristics of light beam passing through its central part but absorbs the light at the periphery. It sort of softens the edges of the aperture making the transition from foreground to background zone very smooth and results in very attractive, natural looking and silky smooth bokeh.

Original name

Lens name as indicated on the lens barrel (usually on the front ring). With lenses from film era, may vary slightly from batch to batch.

Format

Format refers to the shape and size of film or image sensor.

35mm is the common name of the 36x24mm film format or image sensor format. It has an aspect ratio of 3:2, and a diagonal measurement of approximately 43mm. The name originates with the total width of the 135 film which was the primary medium of the format prior to the invention of the full frame digital SLR. Historically the 35mm format was sometimes called small format to distinguish it from the medium and large formats.

APS-C is an image sensor format approximately equivalent in size to the film negatives of 25.1x16.7mm with an aspect ratio of 3:2.

Medium format is a film format or image sensor format larger than 36x24mm (35mm) but smaller than 4x5in (large format).

Angle of view

Angle of view describes the angular extent of a given scene that is imaged by a camera. It is used interchangeably with the more general term field of view.

As the focal length changes, the angle of view also changes. The shorter the focal length (eg 18mm), the wider the angle of view. Conversely, the longer the focal length (eg 55mm), the smaller the angle of view.

A camera's angle of view depends not only on the lens, but also on the sensor. Imaging sensors are sometimes smaller than 35mm film frame, and this causes the lens to have a narrower angle of view than with 35mm film, by a certain factor for each sensor (called the crop factor).

This website does not use the angles of view provided by lens manufacturers, but calculates them automatically by the following formula: 114.6 * arctan (21.622 / CF * FL),

where:

CF – crop-factor of a sensor,
FL – focal length of a lens.

Mount

A lens mount is an interface — mechanical and often also electrical — between a camera body and a lens.

A lens mount may be a screw-threaded type, a bayonet-type, or a breech-lock type. Modern camera lens mounts are of the bayonet type, because the bayonet mechanism precisely aligns mechanical and electrical features between lens and body, unlike screw-threaded mounts.

Lens mounts of competing manufacturers (Canon, Nikon, Pentax, Sony etc.) are always incompatible. In addition to the mechanical and electrical interface variations, the flange focal distance from the lens mount to the film or sensor can also be different.

Lens construction

Lens construction – a specific arrangement of elements and groups that make up the optical design, including type and size of elements, type of used materials etc.

Element - an individual piece of glass which makes up one component of a photographic lens. Photographic lenses are nearly always built up of multiple such elements.

Group – a cemented together pieces of glass which form a single unit or an individual piece of glass. The advantage is that there is no glass-air surfaces between cemented together pieces of glass, which reduces reflections.

Flange focal distance

The flange focal distance (FFD), sometimes called the "flange back", is the distance from the mechanical rear end surface of the lens mount to the focal plane.

Focal length

The focal length is the factor that determines the size of the image reproduced on the focal plane, picture angle which covers the area of the subject to be photographed, depth of field, etc.

Speed

The largest opening or stop at which a lens can be used is referred to as the speed of the lens. The larger the maximum aperture is, the faster the lens is considered to be. Lenses that offer a large maximum aperture are commonly referred to as fast lenses, and lenses with smaller maximum aperture are regarded as slow.

In low-light situations, having a wider maximum aperture means that you can shoot at a faster shutter speed or work at a lower ISO, or both.

Closest focusing distance

The minimum distance from the focal plane (film or sensor) to the subject where the lens is still able to focus.

Closest working distance

The distance from the front edge of the lens to the subject at the maximum magnification.

Magnification ratio

Determines how large the subject will appear in the final image. For example, a magnification ratio of 1:1 means that the image of the subject formed on the film or sensor will be the same size as the subject in real life. For this reason, a 1:1 ratio is often called "life-size".

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Manual focus override in autofocus mode

Allows to perform final focusing manually after the camera has locked the focus automatically. Note that you don't have to switch camera and/or lens to manual focus mode.

Electronic manual focus override is performed in the following way: half-press the shutter button, wait until the camera has finished the autofocusing and then focus manually without releasing the shutter button using the focusing ring.

Electromagnetic diaphragm control system

Provides highly accurate diaphragm control and stable auto exposure performance during continuous shooting.

Convex protruding front element

The convex front element protrudes from the lens barrel, making it impossible to use filters.

Fixed focus

There is no helicoid in this lens and everything is in focus from the closest focusing distance to infinity.

Overall linear extension

The entire lens optical system moves straight backward and forward when focusing is carried out. This is the simplest type of focusing used mainly in wide-angle and standard prime lenses. It has the advantage of introducing relatively little change in aberrations with respect to change in focusing distance. With telephoto and super telephoto lenses this method becomes less beneficial in terms of operability because of the increased size and weight of the lens system.

Front group linear extension

The rear group remains fixed and only the front group moves straight backward and forward during focusing. This method is primarily used in zoom lenses and allows to design comparatively simple lens construction, but also places restrictions on zoom magnification and size reduction.

Front group rotational extension

The lens barrel section holding the front lens group rotates to move the front group backward and forward during focusing. This method of focusing is also used only in zoom lenses.

Internal focusing (IF)

Focusing is performed by moving one or more lens groups positioned between the front lens group and the diaphragm.

Methods of internal and rear focusing have the following advantages:

Rear focusing (RF)

Focusing is performed by moving one or more lens groups positioned behind the diaphragm.

Methods of internal and rear focusing have the following advantages:

Number of blades

As a general rule, the more blades that are used to create the aperture opening in the lens, the rounder the out-of-focus highlights will be.

Some lenses are designed with curved diaphragm blades, so the roundness of the aperture comes not from the number of blades, but from their shape. However, the fewer blades the diaphragm has, the more difficult it is to form a circle, regardless of rounded edges.

At maximum aperture, the opening will be circular regardless of the number of blades.

Weight

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

Maximum diameter x Length

Excluding case or pouch, caps and other detachable accessories (lens hood, close-up adapter, tripod adapter etc.).

For lenses with collapsible design, the length is indicated for the working (retracted) state.

Weather sealing

A rubber material which is inserted in between each externally exposed part (manual focus and zoom rings, buttons, switch panels etc.) to ensure it is properly sealed against dust and moisture.

Lenses that accept front mounted filters typically do not have gaskets behind the filter mount. It is recommended to use a filter for complete weather resistance when desired.

Fluorine coating

Helps keep lenses clean by reducing the possibility of dust and dirt adhering to the lens and by facilitating cleaning should the need arise. Applied to the outer surface of the front and/or rear lens elements over multi-coatings.

Filters

Lens filters are accessories that can protect lenses from dirt and damage, enhance colors, minimize glare and reflections, and add creative effects to images.

Lens hood

A lens hood or lens shade is a device used on the end of a lens to block the sun or other light source in order to prevent glare and lens flare. Flare occurs when stray light strikes the front element of a lens and then bounces around within the lens. This stray light often comes from very bright light sources, such as the sun, bright studio lights, or a bright white background.

The geometry of the lens hood can vary from a plain cylindrical or conical section to a more complex shape, sometimes called a petal, tulip, or flower hood. This allows the lens hood to block stray light with the higher portions of the lens hood, while allowing more light into the corners of the image through the lowered portions of the hood.

Lens hoods are more prominent in long focus lenses because they have a smaller viewing angle than that of wide-angle lenses. For wide angle lenses, the length of the hood cannot be as long as those for telephoto lenses, as a longer hood would enter the wider field of view of the lens.

Lens hoods are often designed to fit onto the matching lens facing either forward, for normal use, or backwards, so that the hood may be stored with the lens without occupying much additional space. In addition, lens hoods can offer some degree of physical protection for the lens due to the hood extending farther than the lens itself.

Rotary zoom

The change of focal length is achieved by turning the zoom ring and the manual focusing - by turning the separate focusing ring.

Push/pull zooming allows for faster change of focal length, however conventional method based on the rotation of the zoom ring provides more accurate and smooth zooming.

Push/pull zoom

The change of focal length and the manual focusing is achieved by one and the same ring. The change of focal length happens when the photographer moves the ring towards the mount or backwards and the rotation of the ring leads to change of focus.

Push/pull zooming allows for faster change of focal length, however conventional method based on the rotation of the zoom ring provides more accurate and smooth zooming.

Zoom lock

The lens features a zoom lock to keep the zoom ring fixed. This function is convenient for carrying a camera with the lens on a strap because it prevents the lens from extending.

Power Zoom

The lens features electronically driven zoom mechanism. It provides smoother, more natural zoom movements than you could accomplish by hand.

The Holy Trinity of lenses

The Holy Trinity of lenses refers to a three-lens set that covers a focal length range from the ultra-wide focal length of 14-16mm all the way long to the telephoto focal length of 200mm. The set typically consists of a 16-35mm ultra-wide angle zoom lens, a 24-70mm standard zoom lens and a 70-200mm telephoto zoom lens and usually represents the best constant-aperture zoom lenses in a manufacturer's lineup. The set is designed to cover almost every genre of photography, be it landscapes, architecture, portraits, weddings, sports, travel or even wildlife (with teleconverter). However, it is also expensive, large and heavy.