Sony FE 14mm F/1.8 GM (SEL14F18GM)

Ultra-wide angle prime lens • Digital era

FE The lens is designed for Sony full-frame digital mirrorless cameras but can be also used on APS-C digital mirrorless cameras.
GM Professional lens with high quality optics and robust build. Meets the highest standards and provides excellent performance and flawless image quality unachievable with traditional optical technologies.

Sony a7

35mm AF digital mirrorless camera

Announced: Oct 2013
Mount: Sony E
Format: 35.8 × 23.9mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a7R

35mm AF digital mirrorless camera

Announced: Oct 2013
Mount: Sony E
Format: 35.9 × 24mm
Resolution: 7360 × 4912 - 36 MP
Sensor type: CMOS
Image stabilizer: -

Sony a7S

35mm AF digital mirrorless camera

Announced: Apr 2014
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 4240 × 2832 - 12 MP
Sensor type: CMOS
Image stabilizer: -

Sony a7 II

35mm AF digital mirrorless camera

Announced: Nov 2014
Mount: Sony E
Format: 35.8 × 23.9mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7R II

35mm AF digital mirrorless camera

Announced: Jun 2015
Mount: Sony E
Format: 35.9 × 24mm
Resolution: 7952 × 5304 - 42 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7S II

35mm AF digital mirrorless camera

Announced: Sep 2015
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 4240 × 2832 - 12 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a9

35mm AF digital mirrorless camera

Announced: Apr 2017
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7R III

35mm AF digital mirrorless camera

Announced: Oct 2017
Mount: Sony E
Format: 35.9 × 24mm
Resolution: 7952 × 5304 - 42 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7 III

35mm AF digital mirrorless camera

Announced: Feb 2018
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7R IV

35mm AF digital mirrorless camera

Announced: Jul 2019
Mount: Sony E
Format: 35.7 × 23.8mm
Resolution: 9504 × 6336 - 60 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a9 II

35mm AF digital mirrorless camera

Announced: Oct 2019
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7S III

35mm AF digital mirrorless camera

Announced: Jul 2020
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 4240 × 2832 - 12 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a7C

35mm AF digital mirrorless camera

Announced: Sep 2020
Mount: Sony E
Format: 35.6 × 23.8mm
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a1

35mm AF digital mirrorless camera

Announced: Jan 2021
Mount: Sony E
Format: 35.9 × 24mm
Resolution: 8640 × 5760 - 50 MP
Sensor type: CMOS
Image stabilizer: Yes

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

ASPH
XD LM
DP/WR
FC
Built-in hood

Specification / 仕様

Production status and name / 生産状況と名称
Announced / 発表: April 2021
Production status / 生産状況: In production
Original name / 元の名前: SONY FE 1.8/14 GM
Optical design / 光学設計
Maximum format / 最大フォーマット: 35mm full frame
Mount / マウント: Sony E
Diagonal angle of view / 対角画角: 114.2° (35mm full frame)
90.5° (Sony E APS-C)
Lens construction / レンズ構造: 14 elements - 11 groups
2 XA, 1 ASPH, 1 Super ED, 2 ED
Convex protruding front element
Diaphragm mechanism / ダイヤフラムメカニズム
Number of blades / 絞り羽根の数: 9
Focusing / フォーカシング
Closest focusing distance / 最短撮影距離: 0.25m
Maximum magnification ratio / 最大倍率: 1:10 at the closest focusing distance
Focusing method / フォーカシング方法: <No information>
Focusing modes / フォーカシングモード: Autofocus, manual focus
Manual focus control / マニュアルフォーカス制御: Focusing ring
Autofocus motor / オートフォーカスモーター: Dual XD Linear Motor
Focus mode selector / フォーカスモードセレクター: AF/MF
Direct Manual Focus (DMF): Determined by the camera
Image stabilizer / 手ぶれ補正
Optical SteadyShot (OSS): -
Physical characteristics / 体格的特徴
Weight / 重量: 460g
Maximum diameter x Length / 最大直径x長さ: ⌀83×99.8mm
Weather sealing / ウェザーシーリング: Dust-proof and water-resistant barrel
Fluorine coating / フッ素コーティング: Front and rear elements
Accessories / 付属品
Filters / フィルタ: Removable front filters are not accepted
Additional features / 追加機能: Rear gelatin filter holder
Lens hood / レンズフード: Built-in petal-shaped
  • Toggle description in Japanese

    メーカーの説明

    超広角14mm、開放F値1.8を約460gの小型・軽量設計で実現。画面周辺部まで緻密に描写する解像性能と美しいぼけ味、高いAF性能を備え、新たな視点から世界を映し出す大口径超広角単焦点G Master

    ソニーの最新の光学技術やシミュレーション技術で、最大径83mm×長さ99.8mm、約460gという小型・軽量設計で超広角14mm、開放F値1.8の単焦点レンズを実現。G Masterならではの画面周辺部までの高い解像性能と美しいぼけ味に加え、超広角レンズながらも歪みを抑えた描写が楽しめます。また、XDリニアモーターを2基搭載することで、静止画・動画を問わずボディのスピード性能を生かした撮影が可能。星景や風景、建造物に加えポートレートやスポーツの撮影など、幅広いシーンで超広角14mm、開放F値1.8ならではのダイナミックな表現を生み出します。さらに、動画の撮影においても超広角レンズならではの遠近感を強調した独創的な表現ができるため、撮影者の表現の幅を広げます。

    超広角14mmながらも開放F値1.8から妥協のない高解像性能

    最前面の大口径レンズを含む2枚の超高度非球面XA(extreme aspherical)レンズの採用など、最新の光学設計で画面全域での高い解像性能を実現

    0.01ミクロン単位という高い精度で表面を製造管理している超高度非球面XA(extreme aspherical)レンズ2枚の採用など、最新の光学設計で画面全域で高い解像性能を実現しています。サジタルフレア(点光源の像のにじみ)を抑制した高い点像再現性を備えているため、特に夜景や星景撮影などで威力を発揮します。

    ED(特殊低分散)ガラス2枚とスーパーEDガラス1枚が色収差を良好に補正

    色収差を大幅に除去するED(特殊低分散)ガラス2枚と、より強い色収差補正力を有し、開放からコントラストの高い描写を実現するスーパーEDガラス1枚を効果的に配置。色収差を良好に補正し、画面周辺での色にじみを抑制します。

    最新の光学設計で超広角14mmながらも歪みを抑えた描写を実現

    超広角14mm、開放F値1.8の単焦点レンズながらも、最新の光学設計で超広角レンズで発生しやすい歪みを良好に補正。歪みの少ないこのレンズは建造物などの撮影にも適しています。

    「ナノARコーティングII」による高い逆光耐性とヌケの良いクリアな画質

    大口径や曲率の大きいレンズにおいても、レンズ全面に均一にコーティングを施せるナノARコーティングIIを採用。太陽光などの強い光が入りこみやすい超広角レンズでも、内面反射によるフレアやゴーストの発生を大幅に抑制し、ヌケの良いクリアな画質を実現します。

    G Masterならではの美しいぼけ味

    2枚の超高度非球面XA(extreme aspherical)レンズや9枚羽根円形絞りの採用、ぼけ味を左右する球面収差コントロールで、G Masterならではの柔らかく自然で美しいぼけ味を実現

    0.01ミクロン単位という高い精度で表面を製造管理し、球面収差のコントロールを行っている超高度非球面XA(extreme aspherical)レンズ2枚の採用など、最新の光学設計で輪線ぼけを大幅に低減。さらに9枚羽根円形絞りを採用することで、G Masterならではの柔らかく、美しいぼけ味を実現しています。

    最短撮影距離0.25mの近接撮影能力

    超広角レンズながらも最短撮影距離0.25mの近接撮影能力を備えており、開放F値1.8の絞りと組み合わせることで背景を大きくぼかした印象的な撮影が可能。静止画・動画を問わず、さまざまな表現ができます。

    最短撮影距離:0.25m

    最大撮影倍率:0.1倍

    超広角大口径レンズながら、約460gの小型・軽量設計

    最新の光学設計と最適なメカ設計で、超広角14mmの大口径レンズながらも最大径83mm×長さ99.8mm、約460gの小型・軽量化を実現。コンパクトなEマウントボディと合わせたときの携行性にも優れているため、機動力が必要とされるシーンでの撮影や、ジンバル・グリップに装着した状態での動画撮影などに適しています。

    静止画・動画を問わず、高レベルな描写をサポートするAF性能

    飛躍的進化を遂げ続けるカメラボディのスピード性能の将来を見据え、さらなる高速駆動を実現するためにソニーが独自に開発したXDリニアモーターを2基搭載することで、大口径レンズながらも高速・高精度・高追随なAF駆動を実現。シビアなフォーカシングが求められるシーンでも、静止画・動画を問わずカメラボディのスピード性能を最大限に発揮し、被写体を正確に捉えて撮影することができます。また、静粛で低振動なAF駆動が可能なため、動画撮影にも適しています。

    プロフェッショナルの要望に応える操作性と信頼性

    フォーカスホールドボタンや絞りリング、クリック切り換えスイッチなどを搭載し、高い操作性を実現

    ボディ側からカスタマイズできるフォーカスホールドボタン

    フォーカスホールドボタンは、ボディ側から好みの機能を割り当ててカスタマイズできます。たとえば、「ピント拡大」を割り当てれば、マニュアルフォーカス時、精緻なフォーカシングが手元で直感的に操作できます。

    クリック切り換えもできる絞りリング

    絞りリングの搭載で、即時性の高い操作を実現。クリックのON/OFFはスイッチで切り換えできます。ON時は、どのくらい絞りを動かしたかを体感できるので、静止画撮影に便利。OFF時は、絞りのクリック音を抑制するとともに、絞り値をシームレスに変化させることができるため、動画撮影に最適です。

    AF/MFを瞬時に切り換えられるフォーカスモードスイッチ

    レンズ側のスイッチでのAF/MFの切り換えに対応。ファインダーから目を離すことなく瞬時に切り換えられ、撮影中も快適に操作できます。

    タイムラグが少なく応答性に優れたリニア・レスポンスMFを採用

    マニュアルフォーカス時の繊細なリング操作にもレスポンスよく反応する、リニア・レスポンスMFを採用。リング回転角度にリニアなフォーカス移動を実現し、撮影者の意図をダイレクトに反映した、精緻なピント合わせができます。

    フッ素コーティングや防塵・防滴(*)性能など、フィールドワークをサポートする信頼性を確保

    最前面と最後部のレンズにフッ素コーティングを施しており、レンズ表面に指紋、ほこり、水滴、油、泥などが付きにくく、付着しても簡単に取り除くことができます。さらに、防塵・防滴(*)に配慮した設計で、屋外での過酷な撮影環境にも耐えられる信頼性を確保しています。

    * 防塵・防滴に配慮した構造となっていますが、ほこりや水滴の浸入を完全に防ぐものではありません 市販のシートタイプのフィルターが装着できるリヤフィルターホルダー

    市販のシートタイプのフィルター(ND、色補正など)を装着できるリヤフィルターホルダーを搭載。また、シートタイプのフィルターを切り抜く際に役立つフィルターテンプレートも付属しています。

    花形固定式のレンズフードと専用のロック付きレンズキャップ

    レンズ一体型のフードで、フレアやゴーストの原因となる光をカットします。また、フードまで覆う専用キャップを付属しています。

Manufacturer description #1

Sony Electronics Continues to Push Boundaries with the Introduction of the Compact, Ultra-wide Angle, Large Aperture FE 14mm F1.8 G Master™ Prime Lens

Newest Addition to Sony’s E-mount Lens Lineup Offers Extraordinary Resolution, Advanced and Quiet Autofocus Capabilities, Beautiful Bokeh Rendering and More

SAN DIEGO, CA – April 20, 2021 – Sony Electronics Inc. further expands its E-mount lens lineup with the introduction of the groundbreaking FE 14mm F1.8 G Master (model SEL14F18GM) – a compact, large F1.8 aperture, ultra-wide angle lens that allows users to capture the world with new perspectives by delivering sharp resolution from corner to corner with little to no distortion, especially when shooting landscapes, architecture, starry skies and interiors.

“Sony continuously strives to meet the needs of our customers with the most advanced tools possible. We’re excited to share the newest member of our G Master series, the FE 14mm F1.8 G Master,” said Yang Cheng, Vice President, Imaging Solutions, Sony Electronics Inc. “This lens sets a new standard for 14mm primes, by delivering extraordinary corner-to-corner resolution and advanced autofocus capabilities in a compact design that has never before been realized in this focal length.”

Extraordinary Resolution in an Incredibly Compact and Lightweight Design

The new FE 14mm F1.8 G Master features a compact design, measuring just 3⅜ in x 4 in (83mm x 99.8mm) and weighing just 16.3 oz (460g), with advanced optical technology that delivers superb resolution and stunning contrast. Two XA (extreme aspherical) elements and one aspherical lens element maintain excellent resolution throughout the entire image area and contribute to its compact and lightweight design. Two ED (Extra-low Dispersion) glass elements and one Super ED glass element result in optical refinements that suppress chromatic aberration and deliver excellent contrast and precise rendering at all apertures.

The FE 14mm F1.8 G Master is useful in all types of low-light situations for both still and movie shooting, thanks to the maximum F1.8 aperture. Users can faithfully render point light sources, like stars for astrophotography, without having to use extremely slow shutter speeds. A common problem plaguing wide angle lenses is light entering at extreme angles that could reflect internally. The FE 14mm F1.8 G Master uses Sony’s original Nano AR Coating II technology to maximize clarity and effectively subdue flare and ghosting.

The FE 14mm F1.8 G Master can produce beautiful bokeh at F1.8, even with the ultra-wide 14mm focal length. With a 9.8-inch minimum focus distance, the FE 14mm F1.8 G Master offers expanded possibilities for close-up still and video shooting and creates stunning bokeh known to Sony’s G Master premium series of lenses. In addition, its precise XA elements, a 9-blade circular aperture mechanism and optimally controlled aberration allow the FE 14mm F1.8 G Master to produce exquisite background bokeh without the undesirable “onion-ring” effect.

Advanced and Quiet Autofocus

Using two XD (extreme dynamic) Linear Motors, focus can be accurately acquired and maintained even when shooting with narrow depth of field at F1.8 giving professional shooters the reliability they need to get the job done in challenging conditions. Moreover, the FE 14mm F1.8 G Master enables quiet AF with minimal vibration for smooth focus transitions, perfect for video content creation.

Professional Level Control and Reliability

The new lens also features several advanced and versatile control options including a focus hold button, a focus mode switch and a focus ring to ensure smooth, efficient operation in a wide range of shooting environments. For added customization, a number of functions can be assigned to the focus hold button from the camera body interface. The FE 14mm F1.8 G Master also features Linear Response MF for direct and precise manual focusing. An aperture ring that allows intuitive aperture control and is also included, with click stops that can be switched ‘on’ for still photography or switched ‘off’ for smooth and quiet iris transition when capturing video. For added creative freedom, the FE 14mm F1.8 G Master includes a rear filter holder that accepts standard sheet-type filters for ND, color correction, soft filter and more.

A dust and moisture resistant design provides the reliability needed for challenging conditions. The front lens element features a fluorine coating that repels water, oil, and other contaminants. The rear element is also fluorine coated to keep that surface clean when changing the rear filter. The lens also has a built-in petal hood that effectively blocks extraneous light that can cause flare and ghosting.

Manufacturer description #2

This large-aperture ultra-wide-angle prime lens offers G Master quality in an innovative design that is incredibly compact. Industry leading technology achieves breathtaking resolution plus exquisite bokeh even at maximum F1.8 aperture. Fast, precise AF plus extraordinary mobility and control give your creative imagination the freedom it deserves.

Two XA (extreme aspherical) elements in a G Master design achieve outstanding corner-to-corner resolution even at maximum F1.8 aperture. One Super ED (Extra-low Dispersion) and two ED glass elements thoroughly suppress color bleeding, while advanced overall optical design minimizes sagittal flare for ideal rendering of point sources.

Precise aspherical elements including two ultra-precise XA elements in an innovative G Master optical design work with two of Sony's state-of-the-art XD Linear Motors to achieve extraordinary performance in a remarkably compact lens that weighs just 16 ounces. Take this lens everywhere and reshape the world with creative new perspectives.

Advanced optics with a high-curvature XA (extreme aspherical) front element minimize sagittal flare when shooting starry skies and other night scenes. The large F1.8 maximum aperture allows low-light shooting without having to use extremely slow shutter speeds, while compact dimensions let you shoot anywhere with ease.

Two ED (Extra-low Dispersion) glass elements that are effective in correcting for chromatic aberration are combined with a Super ED glass element that provides even stronger chromatic compensation for excellent contrast and precise rendering throughout the image area.

With a nine-blade circular aperture mechanism and optimal application of two XA elements, this unique ultra-wide lens lets you emphasize subjects with dynamic close-up perspectives while creating beautiful bokeh in deep, expansive backgrounds.

The sun often ends up in difficult positions when shooting outdoors with an ultra-wide lens, sometimes causing unwanted flare and ghosting. Sony's original Nano AR Coating II technology produces a uniform anti-reflection coating on lens surfaces, effectively subduing flare and ghosting in tricky lighting conditions.

Two XA elements and one aspherical element in a carefully designed optical system offer a minimum focus distance of just 0.82 ft, so you can move right in to shoot dynamic close-ups while taking advantage of the F1.8 maximum aperture to create extraordinarily beautiful background bokeh.

Two XD (extreme dynamic) Linear Motors rapidly and precisely position this lens's large, heavy focus groups for fast, accurate, quiet AF performance that maximizes the speed potential of E-mount bodies. Quiet, low-vibration AF is a huge advantage when shooting movies, while compact mobility and fast response provide unrestrained creative freedom.

Linear Response MF ensures that the focus ring responds directly and linearly to subtle control when focusing manually. Focus ring rotation translates directly to a corresponding change in focus, similar to the response of a mechanical focus system. Control is immediate and precise, so your creative intent is manifest without delay.

A variety of functions can be assigned to the lens's focus hold button from the camera body interface to suit individual shooting preferences. You could assign the Focus Magnifier function, for example, allowing fingertip control of focus magnification for pinpoint manual focus.

An aperture ring that allows intuitive aperture control is provided, with click stops that can be switched on or off as needed. Turn the click stops on for tactile feedback that lets you "feel" the stops, or off when smooth, continuous, silent aperture control supported by the lens's XD Linear Motors is required.

In addition to a fluorine coating on the front element that repels water, oil, and other contaminants, the rear element is also fluorine-coated to keep that surface clean when changing the rear filter. A dust and moisture resistant design maximizes reliability when using this large-aperture ultra-wide-angle lens in challenging outdoor conditions.

Typical application / 典型的なアプリケーション

landscapes, interiors, buildings, cityscapes, travel

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35mm full frame

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

Travellers' choice

Note

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

Professional lens (Top class)

One of the best ultra-wide angle prime lenses

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

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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.

Model produced in a small batch. It is collectible and can only be found on the secondary market.

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.

XD Linear Motor

AF/MF

AFAutofocus mode.
MFManual focus mode.

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.

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.

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.