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Compare Samyang 20mm F1.8 ED AS UMC vs PENTAX-D FA 15-30mm F2.8

Construction

Aperture Blades
7 blades
9 blades
Colors
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Zoom Lens
Image Size
Full-Frame
Full-Frame
Lens Barrel
Physical aperture ring, Distance 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
Motor
Ultrasonic
Optical Formula | Elements
13 elements
18 elements
Optical Formula | Groups
12 groups
13 groups
Optical Formula | Special Glass
Two aspherical + 3 ED elements, Ultra Multi Coating groups
Three ED and aspherical elements + HD and SP coatings groups

Dimensions

Filter Diameter
77 mm / 3.03 in
Size | Diameter
83 mm / 3.27 in
99 mm / 3.90 in
Size | Length
88 mm / 3.46 in
144 mm / 5.67 in
Weight
497 g / 17.56 oz
1040 g / 36.75 oz

Function

Angle Of View
94.5° Diagonal | 84.0° Horizontal | 61.9° Vertical
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
Aperture
f/1.8 ~ f/22
f/2.8 ~ f/22
Autofocus
No
Yes
Focal Length
20 mm
15 mm ~ 30 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
No
Yes

Performance

Max Magnification
0.2x
Min Focus Distance
200 mm / 7.87 in
280 mm / 11.02 in

Production

Accessory
Lens hood included
Lens hood included
Debut
2016-08-08
2016-02-17

Reviews

Neofiliac score
59%
31%
Pros
  • Rather affordable
  • Constant f/2.8 aperture
  • Great optical performance
  • Weather-sealed
  • Beautifully constructed
Cons
  • Lacks weather sealing
  • Not the highest grade of build
  • Rather long
  • On the heavy side
  • Lacks front filter thread

Price

Offers (incl. referral links)
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