Carl Zeiss Touit Planar T* 32mm F/1.8

Standard prime lens • Digital era

T* The multi-layer coating is applied to the surface of lens elements. It boosts light transmission, ensures sharp and high contrast images, minimizes ghosting and flares.

Sample photos

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Sample photos uploaded by users

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Sony NEX-3

APS-C AF digital mirrorless camera

Announced: May 2010
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4592 × 3056 - 14 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-5

APS-C AF digital mirrorless camera

Announced: May 2010
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4592 × 3056 - 14 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-C3

APS-C AF digital mirrorless camera

Announced: Jun 2011
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-5N

APS-C AF digital mirrorless camera

Announced: Aug 2011
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-7

APS-C AF digital mirrorless camera

Announced: Aug 2011
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-F3

APS-C AF digital mirrorless camera

Announced: May 2012
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-5R

APS-C AF digital mirrorless camera

Announced: Aug 2012
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-6

APS-C AF digital mirrorless camera

Announced: Sep 2012
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-3N

APS-C AF digital mirrorless camera

Announced: Feb 2013
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony NEX-5T

APS-C AF digital mirrorless camera

Announced: Aug 2013
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 4912 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Sony a3000

APS-C AF digital mirrorless camera

Announced: Aug 2013
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 5456 × 3632 - 20 MP
Sensor type: CMOS
Image stabilizer: -

Sony a5000

APS-C AF digital mirrorless camera

Announced: Jan 2014
Mount: Sony E
Format: 23.2 × 15.4mm - 1.55x
Resolution: 5456 × 3632 - 20 MP
Sensor type: CMOS
Image stabilizer: -

Sony a6000

APS-C AF digital mirrorless camera

Announced: Feb 2014
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a3500

APS-C AF digital mirrorless camera

Announced: Mar 2014
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 5456 × 3632 - 20 MP
Sensor type: CMOS
Image stabilizer: -

Sony a5100

APS-C AF digital mirrorless camera

Announced: Aug 2014
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a6300

APS-C AF digital mirrorless camera

Announced: Feb 2016
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a6500

APS-C AF digital mirrorless camera

Announced: Oct 2016
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Sony a6400

APS-C AF digital mirrorless camera

Announced: Jan 2019
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a6100

APS-C AF digital mirrorless camera

Announced: Aug 2019
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Sony a6600

APS-C AF digital mirrorless camera

Announced: Aug 2019
Mount: Sony E
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: Yes

Fujifilm X-Pro1

APS-C AF digital mirrorless camera

Announced: Jan 2012
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS
Image stabilizer: -

Fujifilm X-E1

APS-C AF digital mirrorless camera

Announced: Sep 2012
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS
Image stabilizer: -

Fujifilm X-M1

APS-C AF digital mirrorless camera

Announced: Jun 2013
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS
Image stabilizer: -

Fujifilm X-A1

APS-C AF digital mirrorless camera

Announced: Sep 2013
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-E2

APS-C AF digital mirrorless camera

Announced: Oct 2013
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS II
Image stabilizer: -

Fujifilm X-T1

APS-C AF digital mirrorless camera

Announced: Jan 2014
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS II
Image stabilizer: -

Fujifilm X-A2

APS-C AF digital mirrorless camera

Announced: Jan 2015
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-T10

APS-C AF digital mirrorless camera

Announced: May 2015
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS II
Image stabilizer: -

Fujifilm X-E2S

APS-C AF digital mirrorless camera

Announced: Jan 2016
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: X-Trans CMOS II
Image stabilizer: -

Fujifilm X-Pro2

APS-C AF digital mirrorless camera

Announced: Jan 2016
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: X-Trans CMOS III
Image stabilizer: -

Fujifilm X-T2

APS-C AF digital mirrorless camera

Announced: Jul 2016
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: X-Trans CMOS III
Image stabilizer: -

Fujifilm X-A3

APS-C AF digital mirrorless camera

Announced: Aug 2016
Mount: Fujifilm X
Format: 23.5 × 15.7mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-A10

APS-C AF digital mirrorless camera

Announced: Dec 2016
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-T20

APS-C AF digital mirrorless camera

Announced: Jan 2017
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: X-Trans CMOS III
Image stabilizer: -

Fujifilm X-E3

APS-C AF digital mirrorless camera

Announced: Sep 2017
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: X-Trans CMOS III
Image stabilizer: -

Fujifilm X-A20

APS-C AF digital mirrorless camera

Announced: Jan 2018
Mount: Fujifilm X
Format: 23.6 × 15.6mm - 1.53x
Resolution: 4896 × 3264 - 16 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-A5

APS-C AF digital mirrorless camera

Announced: Jan 2018
Mount: Fujifilm X
Format: 23.5 × 15.7mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-H1

APS-C AF digital mirrorless camera

Announced: Feb 2018
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: X-Trans CMOS III
Image stabilizer: Yes

Fujifilm X-T100

APS-C AF digital mirrorless camera

Announced: May 2018
Mount: Fujifilm X
Format: 23.5 × 15.7mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-T3

APS-C AF digital mirrorless camera

Announced: Sep 2018
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: -

Fujifilm X-T30

APS-C AF digital mirrorless camera

Announced: Feb 2019
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: -

Fujifilm X-A7

APS-C AF digital mirrorless camera

Announced: Sep 2019
Mount: Fujifilm X
Format: 23.5 × 15.7mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-Pro3

APS-C AF digital mirrorless camera

Announced: Oct 2019
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: -

Fujifilm X-T200

APS-C AF digital mirrorless camera

Announced: Jan 2020
Mount: Fujifilm X
Format: 23.5 × 15.7mm - 1.53x
Resolution: 6000 × 4000 - 24 MP
Sensor type: CMOS
Image stabilizer: -

Fujifilm X-T4

APS-C AF digital mirrorless camera

Announced: Feb 2020
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: Yes

Fujifilm X-S10

APS-C AF digital mirrorless camera

Announced: Oct 2020
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: Yes

Fujifilm X-E4

APS-C AF digital mirrorless camera

Announced: Jan 2021
Mount: Fujifilm X
Format: 23.5 × 15.6mm - 1.53x
Resolution: 6240 × 4160 - 26 MP
Sensor type: X-Trans CMOS IV
Image stabilizer: -

Designed for / のために設計された

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Features highlight / 機能のハイライト

APS-C
MM

Specification / 仕様

Production status and name / 生産状況と名称
Announced / 発表: September 2013
Production status / 生産状況: In production
Original name / 元の名前: Carl Zeiss Planar 1.8/32 T*
Optical design / 光学設計
Maximum format / 最大フォーマット: APS-C
Mount / マウント: Fujifilm X
Sony E
Diagonal angle of view / 対角画角: 47.9° (Fujifilm X APS-C)
47.7° (Sony E APS-C)
Lens construction / レンズ構造: 8 elements - 5 groups
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: 0.37m
Maximum magnification ratio / 最大倍率: 1:9 at the closest focusing distance
Focusing method / フォーカシング方法: Overall linear extension
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: Micromotor
Focus mode selector / フォーカスモードセレクター: None; focusing mode is set from the camera
Manual focus override in autofocus mode / オートフォーカスモードでの手動フォーカスオーバーライド: Determined by the camera
Image stabilizer / 手ぶれ補正
Image stabilizer / 手ぶれ補正: -
Physical characteristics / 体格的特徴
Weight / 重量: 200g (Sony E)
210g (Fujifilm X)
Maximum diameter x Length / 最大直径x長さ: ⌀75×72mm (Sony E)
⌀75×76mm (Fujifilm X)
Weather sealing / ウェザーシーリング: -
Fluorine coating / フッ素コーティング: -
Accessories / 付属品
Filters / フィルタ: Screw-type 52mm
Lens hood / レンズフード: Bayonet-type 2049-551 (round)

Manufacturer description #1

New ZEISS lenses for compact system cameras

New market segment for ZEISS camera lenses – first members of Touit family with dealers starting June

OBERKOCHEN, June 3, 2013 - Starting immediately, the first two members of the new ZEISS lens family Touit are available with dealers. With the extreme wide angle lens Touit 2.8/12 and the robust standard lens Touit 1.8/32, both for Fujifilm X and Sony NEX cameras, ZEISS is entering the new market for compact system cameras (CSC) with autofocus, interchangeable lenses. The new lens series is characterized by a powerful optical and mechanical design, which fully exploits the potential of the cameras thanks to the low distortion and stray-light absorption. Noteworthy is also the professional product design of the new lens family, which has already won several design prizes.

“With Touit photographers can use ZEISS lenses on two leading mirrorless system cameras,” says Michael Schiehlen, Director of Sales at ZEISS Camera Lenses. “We are addressing this market because it offers interesting application possibilities for sophisticated photographers and because the segment promises very interesting growth.”

By supporting Fujifilm X and Sony NEX, ZEISS has decided on cameras with an APS-C sensor in order to guarantee maximum image quality. The APS-C sensor is the largest possible sensor currently available on the market for this segment. The Touit lenses are characterized by their high production quality, guaranteeing longtime usage. Like all ZEISS lenses they also offer outstanding imaging performance. Typical for the new family is above all the combination of compactness, light weight and precise, durable mechanics. “High imaging quality and light weight are the most important advantages of Touit and are especially interesting for ambitious users of compact system cameras,” says Schiehlen. “The angular view is identical to DSLR lenses for APS-C cameras, but the lens is significantly smaller and lighter.” The metal body underscores the lenses’ robustness and durability. Those parts that are not relevant to key functions were designed in high-quality plastic in order to reduce weight. Compatibility with all Sony NEX and Fujifilm X camera functions, a clearly accentuated 1/3-step aperture ring on the version for Fujifilm X, nine aperture blades for an almost circular bokeh, as well as excellent stray-light absorption through the ZEISS T* coating are the hallmarks of the design of this new lens family.

The Touit 1.8/32 offers the user an angular field that resembles natural eyesight. The goal during the development stage was to create an easy-to-use standard lens that the photographer can leave on the camera continuously and which can be used for a wide range of everyday situations. Touit 1.8/32 was developed according to a modernized Planar design approach that was adapted to today’s requirements: instead of six lens elements, which is common for the Planar, the Touit 1.8/32 is equipped with eight lens elements and therefore offers an even higher i]maging performance when used with digital sensors. The Touit 1.8/32 can be used in many types of situations: travel photography, family photos, photojournalism and portrait applications. The Touit 1.8/32 recently received an iF gold award and red dot product design award for its innovative product design.

As announced during photokina 2012, the Touit 2.8/50 Makro will come on the market at the end of 2013. Other focal lengths will follow.

Manufacturer description #2

A compact standard focal length with autofocus, especially designed and constructed for compact APS-C cameras of the Sony Alpha series with E-Mount and Fujifilm X series. A lens that makes it so easy to spontaneously capture your special moments and preserve them in perfect pictures.

The best of two worlds. Just like a 50 mm lens in 35 mm photography, the ZEISS Touit® 1.8/32 offers the same angle of view as the human eye. However, optimised for use with APS-C format sensors, it is simultaneously a lens that is so light and compact that it can be taken along simply anywhere and everywhere you go. Whether you are shooting portraits, landscapes or spontaneous snapshots, you will never cease to be amazed by what a ZEISS Touit 1.8/32 can tease out of your camera. It is quite simply the ideal companion for capturing perspectives and colour- and lighting moods in perfect pictures.

Typical application / 典型的なアプリケーション

landscapes, interiors, buildings, cityscapes, portraits, street, travel

Best fast standard primes

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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.

One of the best fast standard primes

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

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You are already on the page dedicated to this lens.

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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.

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

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Autofocus lenses for Sony and Fujifilm APS-C mirrorless cameras.

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Zeiss Milvus series

Full-frame manual focus lenses specially designed for modern digital SLR cameras with high-resolution sensors. Optimal image performance for all focal lengths.

Zeiss Classic series

Full-frame manual focus lenses developed for ambitious photographers and their wide diversity of applications: macro, landscape, architecture, portrait, journalism, fashion and beauty. Enjoyed an outstanding reputation with photographers all over the world for many years. Characterized by classic appearance and high optical performance. Offer an excellent entry into premium class photography.

Unique Zeiss Look

Zeiss lenses are one-of-a-kind optical masterpieces that are impressive because of their unique Zeiss Look. This is ensured through exceptional optical design combined with selected materials and the highest quality standards.

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.

Micromotor

Micromotor

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.

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.