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Product Overview
Samyang 20mm F1.8 ED AS UMC is a manual-focus ultra wide-angle prime lens for Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, and Sony E-mount. It covers the full-frame image circle. Introduced by Samyang in 2016, it has 13 elements in 12 groups.
Manual focus may be limiting to some, but purists will find it much more engaging. There are also fewer things to go wrong on the long run. Unfortunately, Samyang has opted to omit weather sealing for this lens, so owners should pay extra attention when shooting in incremental weathers.
The bright maximum aperture for an ultra wide-angle lens is appreciated for night and astro photography. Even though the lens is not stabilized, at this focal range it does not usually matter. In fact, some may be able to get cleaner corners without image stabilization.
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Ratings
What we found**
Neo score 59% (not directly comparable across industries)
Pros
- Rather affordable
Cons
- Lacks weather sealing
- Not the highest grade of build
Price Comparison (incl. referral links)*
Specifications
Construction
Aperture Blades
7 blades
Form Factor
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Lens Mount
Canon EF-mount, Canon EF-M-mount, Fujifilm X-mount, Micro Four Thirds-mount, Nikon F-mount, Pentax K-mount, Samsung NX-mount, Sony A-mount, Sony E-mount
Optical Formula | Elements
13 elements
Optical Formula | Groups
12 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
Dimensions
Filter Diameter
77 mm / 3.03 in
Size | Diameter
83 mm / 3.27 in
Size | Length
88 mm / 3.46 in
Weight
497 g / 17.56 oz
Function
Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
Aperture
f/1.8 ~ f/22
Autofocus
No
Focal Length
20 mm
Focus Type
Internal
Image Stabilization
No
Weather Resistance
No
Performance
Min Focus Distance
200 mm / 7.87 in
Production
Accessory
Lens hood included
Debut
2016-08-08
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**Neo score is the calculated by our AI using advanced models based on the features and qualities of each product. Scores are not directly comparable across industries.
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