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Compare Sigma 35mm F1.4 DG HSM vs Pentax-D FA 21mm F2.4ED vs Pentax-FA645 35mm F3.5

Construction

Aperture Blades
9 blades, rounded
8 blades, Rounded diaphragm
9 blades, Rounded aperture
Colors
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
Distance scale, DoF scale
Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Canon EF-mount, Nikon F-mount, Pentax K-mount, Sigma SA-mount, Sony A-mount, Sony E-mount
Pentax K-mount
Pentax 645 KAF2 bayonet
Material
Plastic barrel, metal mount
Aluminum
Motor
Ring-type ultrasonic
Optical Formula | Elements
13 elements
11 elements
10 elements
Optical Formula | Groups
11 groups
8 groups
7 groups
Optical Formula | Special Glass
4 SLD glass elements, 1 FLD glass element, 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
67 mm / 2.64 in
67 mm / 2.64 in
82 mm / 3.23 in
Size | Diameter
77 mm / 3.03 in
74 mm / 2.91 in
88 mm / 3.46 in
Size | Length
94 mm / 3.70 in
89 mm / 3.50 in
90 mm / 3.54 in
Weight
665 g / 23.50 oz
416 g / 14.70 oz
570 g / 20.14 oz

Function

Angle Of View
63.5° Diagonal | 54.4° Horizontal | 37.8° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
89.9° Diagonal | 79.4° Horizontal | 57.9° Vertical
Aperture
f/1.4 ~ f/16
f/2.4–22 ~ f/2.4–22
f/3.5 ~ f/32
Autofocus
Yes
Yes
Yes
Crop Factor
0.6
Focal Length
35 mm
21 mm
35 mm
Focal Length (35mm Equivalent)
21.7 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
No
Yes
No

Performance

Max Magnification
0.19x
0.26x
0.25x
Min Focus Distance
300 mm / 11.81 in
180 mm / 7.09 in
300 mm / 11.81 in

Production

Accessory
Lens Hood: LH730-03 (supplied)
Lens hood included
Lens Hood: PH-RBE82 (supplied)
Debut
2012-09-17
2021-10-21
2015-11-11
Made In
Japan

Reviews

Neofiliac score
74%
76%
68%
Pros
  • Superb image quality
  • Excellent build quality
  • 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
  • Lacks weather sealing

Price

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