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Compare Samyang 24mm F1.4 ED AS IF UMC vs Pentax-D FA 21mm F2.4ED vs Pentax-FA645 35mm F3.5

Construction

Aperture Blades
8 blades, Rounded diaphragm
9 blades, Rounded aperture
Colors
Black
Black, Silver
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Medium Format (645)
Lens Barrel
Physical aperture ring, Distance scale, DoF scale
Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Micro Four Thirds-mount, Pentax K-mount, Sony A-mount, Sony E-mount, Samsung NX-mount
Pentax K-mount
Pentax 645 KAF2 bayonet
Material
Aluminum
Optical Formula | Elements
13 elements
11 elements
10 elements
Optical Formula | Groups
12 groups
8 groups
7 groups
Optical Formula | Special Glass
4 ED glass elements, 2 aspherical elements groups
4 ED elements, 1 Super ED element groups
HRI and hybrid aspherical elements, HD and SP coatings 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
88 mm / 3.46 in
Size | Length
89 mm / 3.50 in
90 mm / 3.54 in
Weight
416 g / 14.70 oz
570 g / 20.14 oz

Function

Angle Of View
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
89.9° Diagonal | 79.4° Horizontal | 57.9° Vertical
Aperture
f/1.4 ~ f/22
f/2.4–22 ~ f/2.4–22
f/3.5 ~ f/32
Autofocus
No
Yes
Yes
Crop Factor
0.6
Focal Length
24 mm
21 mm
35 mm
Focal Length (35mm Equivalent)
21.7 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
No
Yes
No

Performance

Max Magnification
0.26x
0.25x
Min Focus Distance
250 mm / 9.84 in
180 mm / 7.09 in
300 mm / 11.81 in

Production

Accessory
Lens hood included
Lens Hood: PH-RBE82 (supplied)
Debut
2011-08-12
2021-10-21
2015-11-11

Reviews

Neofiliac score
59%
76%
68%
Pros
  • Bright maximum aperture
  • Affordable choice in its class
  • Weather-sealed
  • Great image quality
  • 8-bladed aperture for sunstars
  • 0.25x reproduction ratio
  • Rather compact for what it is
  • Comes with physical aperture ring
Cons
  • Lacks weather sealing
  • Not the best IQ
  • Not the highest grade of construction
  • Lacks weather sealing

Price

Offers (incl. referral links)
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