Compare Pentax-DA 10-17mm F3.5-4.5 vs Pentax-D FA 21mm F2.4ED vs Pentax-D FA* 50mm F1.4
Construction
Aperture Blades
6 blades
8 blades, Rounded diaphragm
9 blades
Colors
Black
Black, Silver
Black
Form Factor
Ultra Wide-Angle Zoom Lens
Ultra Wide-Angle Prime Lens
Normal Prime Lens
Image Size
APS-C
Full-Frame
Full-Frame
Lens Barrel
Distance 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
10 elements
11 elements
15 elements
Optical Formula | Groups
8 groups
8 groups
9 groups
Optical Formula | Special Glass
ED element, HD + Super Protective coatings 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
67 mm / 2.64 in
72 mm / 2.83 in
Size | Diameter
68 mm / 2.68 in
74 mm / 2.91 in
80 mm / 3.15 in
Size | Length
70 mm / 2.76 in
89 mm / 3.50 in
106 mm / 4.17 in
Weight
317 g / 11.20 oz
416 g / 14.70 oz
910 g / 32.16 oz
Function
Angle Of View
180° Diagonal (wide) ~ 100° Diagonal
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/3.5–4.5 ~ f/22–32
f/2.4–22 ~ f/2.4–22
f/1.4 ~ f/16
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
Focal Length
10 mm ~ 17 mm
21 mm
50 mm
Focal Length (35mm Equivalent)
15.0 mm ~ 25.5 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
Weather Resistance
No
Yes
Yes
Zoom Type
External zoom
Performance
Max Magnification
0.39x
0.26x
0.18x
Min Focus Distance
140 mm / 5.51 in
180 mm / 7.09 in
400 mm / 15.75 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2019-07-08
2021-10-21
2017-10-26
Reviews
Neofiliac score
31%
76%
68%
Pros
- Ultra-wide fisheye offers unique creative possibilities
- Weather-sealed
- Great image quality
- 8-bladed aperture for sunstars
- Bright maximum aperture
- Weather-sealed
- Very sharp
Cons
- Lacks front filter thread
- External zoom without zoom lock
- Lacks weather sealing
- Not the strongest optical performance
- On the heavy side
- Slow autofocus
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