Compare PENTAX-D FA 15-30mm F2.8 vs Pentax DA 15mm F4 vs Pentax-FA 31mm F1.8
Construction
Aperture Blades
9 blades
9 blades, Rounded aperture diaphragm
9 blades
Colors
Black
Black, Silver
Black, silver
Form Factor
Ultra Wide-Angle Zoom Lens
Ultra Wide-Angle Prime Lens
Wide-Angle Prime Lens
Image Size
Full-Frame
APS-C
Full-Frame
Lens Barrel
Distance scale
Distance scale, DoF scale
Physical aperture ring, Distance scale, DoF scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Ultrasonic
Screw drive from camera
Screw drive from camera
Optical Formula | Elements
18 elements
8 elements
9 elements
Optical Formula | Groups
13 groups
6 groups
7 groups
Optical Formula | Special Glass
Three ED and aspherical elements + HD and SP coatings groups
1 Hybrid aspherical element, 1 ED glass element, High-grade multi-layer HD (High Definition) Coating groups
HD + Super Protect coatings groups
Dimensions
Filter Diameter
49 mm / 1.93 in
58 mm / 2.28 in
Size | Diameter
99 mm / 3.90 in
63 mm / 2.48 in
65 mm / 2.56 in
Size | Length
144 mm / 5.67 in
40 mm / 1.57 in
69 mm / 2.72 in
Weight
1040 g / 36.75 oz
189 g / 6.68 oz
341 g / 12.05 oz
Function
Angle Of View
110.6° Diagonal | 100.4° Horizontal | 77.3° Vertical (wide) ~ 71.6° Diagonal | 61.9° Horizontal | 43.6° Vertical (tele)
87.8° Diagonal | 77.3° Horizontal | 56.1° Vertical
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
Aperture
f/2.8 ~ f/22
f/4 ~ f/22
f/1.8 ~ f/22
Autofocus
Yes
Yes
Yes
Crop Factor
1.5
Focal Length
15 mm ~ 30 mm
15 mm
31 mm
Focal Length (35mm Equivalent)
22.5 mm
Focus Type
Internal
Unit
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
No
Performance
Max Magnification
0.2x
0.15x
0.16x
Min Focus Distance
280 mm / 11.02 in
180 mm / 7.09 in
300 mm / 11.81 in
Production
Accessory
Lens hood included
Lens Hood: built-in hood (supplied)
Lens hood included
Debut
2016-02-17
2013-08-27
2021-02-24
Reviews
Neofiliac score
31%
59%
50%
Pros
- Constant f/2.8 aperture
- Great optical performance
- Weather-sealed
- Beautifully constructed
- Exceptionally light and compact
- Good weather resistance
- Comes with physical aperture ring
- Beautifully built
Cons
- Rather long
- On the heavy side
- Lacks front filter thread
- Not the highest IQ level
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
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