Site Title

Compare Samyang 20mm F1.8 ED AS UMC vs Pentax-D FA 21mm F2.4ED vs Pentax-D FA* 85mm F1.4

Reviews

Neo score
59%
76%
68%
Pros
  • Rather affordable
  • Weather-sealed
  • Great image quality
  • 8-bladed aperture for sunstars
  • Bright maximum aperture
  • Weather-sealed
  • Premium design and construction
Cons
  • Lacks weather sealing
  • Not the highest grade of build
  • Large diameter
  • On the heavy side

Price

MSRP
1400 USD
Offers (incl. referral links)

Construction

Aperture Blades
7 blades
8 blades, Rounded diaphragm
9 blades
Colors
Black, Silver
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Short Telephoto Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance scale
Distance scale, DoF scale
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
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Ring-type ultrasonic
Optical Formula | Elements
13 elements
11 elements
12 elements
Optical Formula | Groups
12 groups
8 groups
10 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
4 ED elements, 1 Super ED element groups
1 aspherical + 3 Super ED elements, HD coating groups

Dimensions

Filter Diameter
77 mm / 3.03 in
67 mm / 2.64 in
82 mm / 3.23 in
Size | Diameter
83 mm / 3.27 in
74 mm / 2.91 in
95 mm / 3.74 in
Size | Length
88 mm / 3.46 in
89 mm / 3.50 in
124 mm / 4.88 in
Weight
497 g / 17.56 oz
416 g / 14.70 oz
1255 g / 44.35 oz

Function

Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
28.6° Diagonal | 23.9° Horizontal | 16.1° Vertical
Aperture
f/1.8 ~ f/22
f/2.4–22 ~ f/2.4–22
f/1.4 ~ f/16
Autofocus
No
Yes
Yes
Focal Length
20 mm
21 mm
85 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
Yes

Performance

Max Magnification
0.26x
0.12x
Min Focus Distance
200 mm / 7.87 in
180 mm / 7.09 in
850 mm / 33.46 in

Production

Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-08-08
2021-10-21
2020-05-27
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