Compare PENTAX-D FA 15-30mm F2.8 vs Pentax-FA 31mm F1.8 vs Pentax-D FA* 50mm F1.4
Construction
Aperture Blades
9 blades
9 blades
9 blades
Colors
Black
Black, silver
Black
Form Factor
Ultra Wide-Angle Zoom Lens
Wide-Angle Prime Lens
Normal Prime Lens
Image Size
Full-Frame
Full-Frame
Full-Frame
Lens Barrel
Distance scale
Physical aperture ring, Distance scale, DoF scale
Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax K-mount
Material
Aluminum
Motor
Ultrasonic
Screw drive from camera
Ring-type ultrasonic
Optical Formula | Elements
18 elements
9 elements
15 elements
Optical Formula | Groups
13 groups
7 groups
9 groups
Optical Formula | Special Glass
Three ED and aspherical elements + HD and SP coatings groups
HD + Super Protect coatings groups
1 aspherical + 3 anamalous dispersion elements, Aero Bright II + HD + Super Protect coatings groups
Dimensions
Filter Diameter
58 mm / 2.28 in
72 mm / 2.83 in
Size | Diameter
99 mm / 3.90 in
65 mm / 2.56 in
80 mm / 3.15 in
Size | Length
144 mm / 5.67 in
69 mm / 2.72 in
106 mm / 4.17 in
Weight
1040 g / 36.75 oz
341 g / 12.05 oz
910 g / 32.16 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)
69.9° Diagonal | 60.3° Horizontal | 42.3° Vertical
46.8° Diagonal | 39.6° Horizontal | 27.0° Vertical
Aperture
f/2.8 ~ f/22
f/1.8 ~ f/22
f/1.4 ~ f/16
Autofocus
Yes
Yes
Yes
Focal Length
15 mm ~ 30 mm
31 mm
50 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
No
Yes
Performance
Max Magnification
0.2x
0.16x
0.18x
Min Focus Distance
280 mm / 11.02 in
300 mm / 11.81 in
400 mm / 15.75 in
Production
Accessory
Lens hood included
Lens hood included
Lens hood included
Debut
2016-02-17
2021-02-24
2017-10-26
Reviews
Neofiliac score
31%
50%
68%
Pros
- Constant f/2.8 aperture
- Great optical performance
- Weather-sealed
- Beautifully constructed
- Comes with physical aperture ring
- Beautifully built
- Bright maximum aperture
- Weather-sealed
- Very sharp
Cons
- Rather long
- On the heavy side
- Lacks front filter thread
- Only f/1.8 for the price
- Lacks weather sealing
- Unusual focal length
- On the heavy side
- Slow autofocus
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