Compare Pentax DA 21mm F3.2 vs Pentax-D FA 21mm F2.4ED vs Pentax-D FA* 50mm F1.4
Construction
Aperture Blades
7 blades, Rounded aperture diaphragm
8 blades, Rounded diaphragm
9 blades
Colors
Black, Silver
Black, Silver
Black
Form Factor
Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Normal Prime Lens
Image Size
APS-C
Full-Frame
Full-Frame
Lens Barrel
Distance scale, DoF scale
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Screw drive from camera
Ring-type ultrasonic
Optical Formula | Elements
8 elements
11 elements
15 elements
Optical Formula | Groups
5 groups
8 groups
9 groups
Optical Formula | Special Glass
High-grade multi-layer HD (High Definition) Coating groups
4 ED elements, 1 Super ED element groups
1 aspherical + 3 anamalous dispersion elements, Aero Bright II + HD + Super Protect coatings groups
Dimensions
Filter Diameter
49 mm / 1.93 in
67 mm / 2.64 in
72 mm / 2.83 in
Size | Diameter
63 mm / 2.48 in
74 mm / 2.91 in
80 mm / 3.15 in
Size | Length
25 mm / 0.98 in
89 mm / 3.50 in
106 mm / 4.17 in
Weight
134 g / 4.73 oz
416 g / 14.70 oz
910 g / 32.16 oz
Function
Angle Of View
69.0° Diagonal | 59.5° Horizontal | 41.7° Vertical
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/3.2 ~ f/22
f/2.4–22 ~ f/2.4–22
f/1.4 ~ f/16
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
Focal Length
21 mm
21 mm
50 mm
Focal Length (35mm Equivalent)
31.5 mm
Focus Type
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
Performance
Max Magnification
0.17x
0.26x
0.18x
Min Focus Distance
200 mm / 7.87 in
180 mm / 7.09 in
400 mm / 15.75 in
Production
Accessory
Lens Hood: MH-RBB43 (supplied)
Lens hood included
Lens hood included
Debut
2013-08-27
2021-10-21
2017-10-26
Reviews
Neofiliac score
59%
76%
68%
Pros
- Very compact
- Very light
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Bright maximum aperture
- Weather-sealed
- Very sharp
Cons
- Dark aperture
- A bit expensive for an f/3.2 pancake
- A bit weak on IQ
- On the heavy side
- Slow autofocus
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