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21mm T1.5 ED AS UMC CS

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Compact Lens to Capture Broad World

Wide Angle Manual Focus Cine Lens for Mirrorless Cameras

Samyang Optics 21mm T1.5 ED AS UMC CS is a wide angle manual focus cine lens for mirrorless cameras with APS-C sensor sizes. It is a compact cine lens to capture the broad world. With broad 21mm angle of view and 3 glass aspherical lenses, it provides an opportunity to experience the depth and breadth of image. Samyang 21mm T1.5 can be used for various purposes, especially for portraits.

Cine Lens Features

Samyang 21mm T1.5 ED AS UMC CS allows more delicate video work with T number marks. The focus gear ring is installed for follow focus system. You may change the aperture quietly and smoothly with the uncoupled aperture gear rings. Also, distance scale and T numbers are marked on both sides of the lens for convenience.

Optical Features

Samyang 21mm T1.5 ED AS UMC CS has a low T number (T1.5). You may precisely control the lens when shooting under various exposure environment including relatively dark situations. This lens features 8 glasses in 7 groups including 1 extra low dispersion lens (ED) and 3 glass aspherical lenses (ASP) to offer high resolution throughout the image. Ultra Multi Coating(UMC) of Samyang Optics is used to optimize the light penetration and minimizes flare and ghost. With such optical construction, it has 0.28m of minimum Focusing Distance to capture the object in a close distance.

Hardware Features

There are 9 aperture blades designed to be almost as a full circle when aperture is closed which expresses starlike ray clearly and beautifully. The solid frame of the lens is made of high-strength aluminum alloy so you can create trustworthy images. This compact and light-weighted lens is specially designed for mirrorless cameras for portability. Also, detachable petal-shaped lens hood minimizes flare and ghost by sheltering lens from unnecessary lights. Available for 4 mirrorless camera mounts: Sony E, MFT, Fuji-X and Canon M.
※ Size and design may vary depending on the mount of a lens

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Technical Information
  • Specifications
    Specifications 21mm T1.5 ED AS UMC CS
    Aperture Range T1.5 ~ T22
    Optical
    Construction    		 8 ELEMENTS IN 7 GROUPS
    (3 ASPHERICAL LENS)
    Minimum
    Focusing Distance    		 0.28m (0.92ft)
    Filter Size 58.0mm
    Maximum Diameter 73.6mm
    Mount CANON
    M    		 FUJIFILM
    X    		 SONY
    E    		 MICRO
    FOUR
    -THIRDS
    Angle Of View APS-C 66.4˚ 69.3˚ 69.3˚ -
    FOUR-THIRDS
    (4/3")    		 - - - 55.6˚
    Length(mm) 67.5mm 67.9mm 67.6mm 66.4mm
    Weight(g) 290g 305g 290g 300g
    Gear Module 0.8mm
    A 7.5mm
    B 6.0mm
    C 30.4mm
    D 16.4mm 16.8mm 9mm 16.5mm
    Focus Ring Diameter 73.6mm
    Aperture Ring Diameter 64.0mm
  • MTF CHART 










  • Optical Construction 

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Samyang’s Guide to Achieving the Optimal Angle of View

The perfect spacing and distance are always necessary when shooting all kinds of subjects, including people, to give them a proper relationship with the beautiful space around them. So, what’s the exact distance that helps you best appreciate a work of art, or a photo?

The correct answer is the diagonal length of the full frame of a subject.

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The best standpoint from which to appreciate the full view of a subject is the distance of the diagonal length of the subject frame. This wider angle is superior to standing closer at a 50 degree angle to get a more detailed view. This notion of an ideal distance or view point is also applicable in the world of photography.

For still images, keeping a distance equal to the diagonal length of the full image surface is recommended. The full frame sensor of a digital camera is 36 x 24mm and the diagonal length is 43.26mm so any distance close to this number is nearer to the ideal than the currently accepted industry standard of 50mm.

Back when film cameras were common, 45mm was the industry standard and this continued as reflex cameras needed extra space to fit a mirror. However, as mirrorless cameras become more popular again, there has been a need to return to this industry standard…which is the impetus for the Samyang AF 45mm F1.8 FE. With less distortion than a 35mm lens and wider angles than a 55mm lens, the Samyang AF 45mm F1.8 FE is a perfect lens for portraits, landscapes, architecture photography, and pictures of pets.

What is Preset Aperture Control Function?

On the Preset Aperture Control function, the aperture blade operates smoothly like a "De-clicked lens", which is advantageous for video recording.
Fujifilm cameras are engineered to control the aperture according to the minimum exposure value(F-stop), so when the camera controls the aperture, it blinks momentarily to set the proper exposure.

AF 75mm F1.8 X intentionally disconnects the communication with the camera body and the lens itself on the Preset Aperture Control function, so it is possible to smoothly adjust the exposure without flickering. ISO and shutter speed are adjusted according to the changed exposure by controlling the aperture, so the exposure value can be changed even with the 1/2 F-stop.

What is Preset Aperture Control Function?

On the Preset Aperture Control function, the aperture blade operates smoothly like a "De-clicked lens", which is advantageous for video recording.
Fujifilm cameras are engineered to control the aperture according to the minimum exposure value(F-stop), so when the camera controls the aperture, it blinks momentarily to set the proper exposure.

AF 75mm F1.8 X intentionally disconnects the communication with the camera body and the lens itself on the Preset Aperture Control function, so it is possible to smoothly adjust the exposure without flickering. ISO and shutter speed are adjusted according to the changed exposure by controlling the aperture, so the exposure value can be changed even with the 1/2 F-stop.

What is Recommended Settings for Preset Aperture Control Function?

The Preset Aperture Control function operates only when shooting video(Movie mode) and the focusing mode of the camera is set to AF mode. Please set the aperture at f/1.8 before switching the "Custom Switch" to "Mode 2. It is recommended to set the "Exposure mode" as A mode (Aperture Priority AE) or M mode (Manual Exposure).

* How to use the “Preset Aperture Control” function?

1) Camera Body Setting
      AF Mode → Video Mode ('A' or 'M' mode) → Set the Aperture @F1.8
(2) Lens Setting
      Switch your "Custom Switch” to “Mode 2(M2)"
(3) Now, you're ready to use the Preset Aperture Control function with your focus ring

What is Recommended Settings for Preset Aperture Control Function?

The Preset Aperture Control function operates only when shooting video(Movie mode) and the focusing mode of the camera is set to AF mode. Please set the aperture at f/1.8 before switching the "Custom Switch" to "Mode 2. It is recommended to set the "Exposure mode" as A mode (Aperture Priority AE) or M mode (Manual Exposure).

* How to use the “Preset Aperture Control” function?

1) Camera Body Setting
      AF Mode → Video Mode ('A' or 'M' mode) → Set the Aperture @F1.8
(2) Lens Setting
      Switch your "Custom Switch” to “Mode 2(M2)"
(3) Now, you're ready to use the Preset Aperture Control function with your focus ring

[What is Dolly Shot? How to Shoot Easily]

[What is Dolly shot?]

A dolly shot, also referred to as a tracking shot or trucking shot, is a camera movement technique used by cinematographers to track and follow a subject in motion. To achieve this, the camera is mounted on a device called a "dolly," which facilitates smooth tracking movement. The dolly can move in front of, behind, or alongside the subject, which can be a person, a location, a product, or any other object of focus in the frame. Through this, you can control the emotional distance between the subject and the viewer by highlighting the audiovisual and dramatic effects.

[How to take a Dolly Shot simply by handheld]

Tip. If the moving distance is long, the camera may shake, so please shoot at a focal length between 35 and 100mm.
1. Stand at a distance of about 1.5 to 2 meters away from the subject.
2. Set the custom switch to MF and Mode 3 and adjust the focal length to about 100mm.
3. After focusing on the subject, set the aperture to F8~16.
4. Slowly turn the zoom ring to the left (towards the wide-angle end) while using your upper body and arms to move the camera toward your subject.
5. Dolly Shot complete!
※ When shooting from a farther distance from the subject, use a cart or gimbal for more stable shooting.

DSLR / Full Frame
1D X Mark Ⅱ
1D X
1Ds Mark Ⅲ
1Ds
5DsR
5Ds
5D Mark Ⅳ
5D Mark Ⅲ
6D Mark Ⅱ
6D
DSLR / APS-H
1D Mark Ⅲ
1D
Mirrorless / APS-C
M6
M5
M10
M3
M2
DSLR / APS-S
7D Mark Ⅱ
7D
80D
70D
60D
30D
D60
D30
77D (9000D)
760D (8000D / Rebel T6s)
1300D (Kiss X80 / Rebel T6)
1200D (Kiss X70 / Rebel T5)
200D (Kiss X9 / Rebel SL2)
800D (Kiss X9i / Rebel T7i)
700D (Kiss X9i / Rebel T7i)
100D (Kiss X7 / Rebel SL1)
650D (Kiss X6i / Rebel T4i)
600D (Kiss X5 / Rebel T3i)
550D (Kiss X4 / Rebel T2i)
500D (Kiss X3 / Rebel T1i)
1000D (Kiss F / Rebel XS)
450D (Kiss X2 / Rebel X냐)
DSLR / Full Frame
D850
D5
D810A
D4S
D810
D750
Df
D610
D4
D800
D800E
D600
D3s
D3x
D700
D3
DSLR / APS-C
D7500
D3400
D500
D5600
D7200
D5500
D3300
D7100
D5300
D5200
D7000
D300s
D300
DSLR / Full Frame
Z6
Z7
D810A
D4S
D750
D810A
DSLR / APS-C
D7200
D500
D3300
D5500
D5600
D3400
D7500

* Cameras released within 5 years from 2019 are tested.

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