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Samyang 21 mm f/1.4 ED AS UMC CS

Manufacturer Samyang
Model 21 mm f/1.4 ED AS UMC CS
Lens style Wide angle
Focal length 21 mm
Maximum aperture f/1.4
Angle of view 69.3 o
Closest focusing distance 0.3 m
Maximum magnification
Minimum aperture 22
Number of diaphragm blades 9
Auto focus type MF
Lens Construction 8 elements / 7 groups
Filter diameter 58 mm
Macro No
Available mounts Micro Four Thirds
Sony E
Fujifilm X
Canon EF-M
Dimensions 64.3 x 66.4 mm
Weight 285 g
Additional information Announced: 21.09.2015
Lens known under the brand Rokinon
Size and weight data for MFT version
Average rating (2 owners reviews)
Build quality
Optical quality
Value for money


4.50 Good
Owners reviews (2)
  1. Bengt C
    Bengt C 25 May 2020, 13:59
    Build quality
    Optical quality
    Value for money


    IP 212.3.x.x
    Owner since: 6 months
    Price: 320 EURO +
    User profile: Amateur

    Cons: Focus ring turns at the slightest touch. Front cap is impossible to handle, rear cap falls off (X-mount). No EXIF data.

    Pros: Great image quality! Very solid build. No electronics that can break.

    Summary: This lens is a very good performer (obviously lenstip.com was unfortunate with their copy). The build is very solid. The focusing ring has perfect viscous damping, but the initial friction is too low; it turns at the slightest touch. If focusing isn\'t your absolutely last step before pressing the shutter, you really have to concentrate to not touch the focus ring again after nailing focus. Another difficulty is to set normal working distances using the scale. All numbers are distances up to 2 m. I use focusing tables extensively, and would appreciate a few focal scale numbers between 2 m and infinity. Dialing in 3-5 m is difficult to do with accuracy. Fortunately infinity is well calibrated at the end stop, so focusing a la Merklinger can be done quickly. Two minor disappointments are the more-than-advertised weight of 320 g and the fact that true max aperture is something like f/1.6. The latter is evident by observing the meter when selecting apertures. The lens is a bit expensive, considering it\'s entirely manual.

  2. tumancho
    tumancho 2 August 2018, 11:27
    Build quality
    Optical quality
    Value for money


    IP 93.155.x.x
    Owner since: 3 months
    Price: 250EUR
    User profile: Amateur

    Cons: manual focus, heavy for my taste

    Pros: very sharp, sharper than fujinon 35 f2 and very simular to fujinon 50 f2, better colors than fujinons, blue sky is better compared to fujinons with polar filter, f1.4 is sharp too

    Summary: You can bye it after reading this review, if you can live without autofocus it is your lens !!!!

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