Compare Pentax-D FA 21mm F2.4ED vs Pentax-DA 10-17mm F3.5-4.5 vs Pentax-DA* 16-50mm F2.8
Construction
Aperture Blades
8 blades, Rounded diaphragm
6 blades
9 blades
Colors
Black, Silver
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Zoom Lens
Standard Zoom Lens
Image Size
Full-Frame
APS-C
APS-C
Lens Barrel
Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Magnesium alloy
Motor
Screw drive from camera
Stepper motor
Optical Formula | Elements
11 elements
10 elements
16 elements
Optical Formula | Groups
8 groups
8 groups
10 groups
Optical Formula | Special Glass
4 ED elements, 1 Super ED element groups
ED element, HD + Super Protective coatings groups
ED + anomalous glass + aspherical elements, HD coating groups
Dimensions
Filter Diameter
67 mm / 2.64 in
77 mm / 3.03 in
Size | Diameter
74 mm / 2.91 in
68 mm / 2.68 in
84 mm / 3.31 in
Size | Length
89 mm / 3.50 in
70 mm / 2.76 in
117 mm / 4.61 in
Weight
416 g / 14.70 oz
317 g / 11.20 oz
712 g / 25.16 oz
Function
Angle Of View
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
180° Diagonal (wide) ~ 100° Diagonal
84.1° Diagonal | 73.7° Horizontal | 53.1° Vertical (wide) ~ 32.2° Diagonal | 27.0° Horizontal | 18.2° Vertical (tele)
Aperture
f/2.4–22 ~ f/2.4–22
f/3.5–4.5 ~ f/22–32
f/2.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
1.5
Focal Length
21 mm
10 mm ~ 17 mm
16 mm ~ 50 mm
Focal Length (35mm Equivalent)
15.0 mm ~ 25.5 mm
24.0 mm ~ 75.0 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
Weather Resistance
Yes
No
Yes
Zoom Type
External zoom
External zoom
Performance
Max Magnification
0.26x
0.39x
0.24x
Min Focus Distance
180 mm / 7.09 in
140 mm / 5.51 in
300 mm / 11.81 in
Production
Accessory
Lens hood included
Lens hood included
Lens Hood: PH-RBN77 (sold separately)
Debut
2021-10-21
2019-07-08
2021-07-14
Reviews
Neofiliac score
76%
31%
40%
Pros
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Ultra-wide fisheye offers unique creative possibilities
- Weather-sealed
- Solid build quality
Cons
- Lacks front filter thread
- External zoom without zoom lock
- Lacks weather sealing
- Not the strongest optical performance
- Exterior designed like a 1990's lens
- External zoom without zoom lock
- Lens hood not included
- Expensive for APS-C
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