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Compare 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, Silver
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Medium Format (645)
Lens Barrel
Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Pentax K-mount
Pentax 645 KAF2 bayonet
Material
Aluminum
Optical Formula | Elements
11 elements
10 elements
Optical Formula | Groups
8 groups
7 groups
Optical Formula | Special Glass
4 ED elements, 1 Super ED element groups
HRI and hybrid aspherical elements, HD and SP coatings groups

Dimensions

Filter Diameter
67 mm / 2.64 in
82 mm / 3.23 in
Size | Diameter
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
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
89.9° Diagonal | 79.4° Horizontal | 57.9° Vertical
Aperture
f/2.4–22 ~ f/2.4–22
f/3.5 ~ f/32
Autofocus
Yes
Yes
Crop Factor
0.6
Focal Length
21 mm
35 mm
Focal Length (35mm Equivalent)
21.7 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
Weather Resistance
Yes
No

Performance

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

Production

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

Reviews

Neofiliac score
76%
68%
Pros
  • 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

Price

Offers (incl. referral links)
Remove
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