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Compare PENTAX-D FA 15-30mm F2.8 vs Pentax-D FA 21mm F2.4ED vs Pentax-FA645 35mm F3.5

Construction

Aperture Blades
9 blades
8 blades, Rounded diaphragm
9 blades, Rounded aperture
Colors
Black
Black, Silver
Form Factor
Ultra Wide-Angle Zoom Lens
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Image Size
Full-Frame
Full-Frame
Medium Format (645)
Lens Barrel
Distance scale
Distance scale, DoF scale
Physical aperture ring, Distance scale
Lens Mount
Pentax K-mount
Pentax K-mount
Pentax 645 KAF2 bayonet
Material
Aluminum
Motor
Ultrasonic
Optical Formula | Elements
18 elements
11 elements
10 elements
Optical Formula | Groups
13 groups
8 groups
7 groups
Optical Formula | Special Glass
Three ED and aspherical elements + HD and SP coatings groups
4 ED elements, 1 Super ED element groups
HRI and hybrid aspherical elements, HD and SP coatings groups

Dimensions

Filter Diameter
67 mm / 2.64 in
82 mm / 3.23 in
Size | Diameter
99 mm / 3.90 in
74 mm / 2.91 in
88 mm / 3.46 in
Size | Length
144 mm / 5.67 in
89 mm / 3.50 in
90 mm / 3.54 in
Weight
1040 g / 36.75 oz
416 g / 14.70 oz
570 g / 20.14 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)
91.7° Diagonal | 81.2° Horizontal | 59.5° Vertical
89.9° Diagonal | 79.4° Horizontal | 57.9° Vertical
Aperture
f/2.8 ~ f/22
f/2.4–22 ~ f/2.4–22
f/3.5 ~ f/32
Autofocus
Yes
Yes
Yes
Crop Factor
0.6
Focal Length
15 mm ~ 30 mm
21 mm
35 mm
Focal Length (35mm Equivalent)
21.7 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
No
No
No
Weather Resistance
Yes
Yes
No

Performance

Max Magnification
0.2x
0.26x
0.25x
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 included
Lens Hood: PH-RBE82 (supplied)
Debut
2016-02-17
2021-10-21
2015-11-11

Reviews

Neofiliac score
31%
76%
68%
Pros
  • Constant f/2.8 aperture
  • Great optical performance
  • Weather-sealed
  • Beautifully constructed
  • Weather-sealed
  • Great image quality
  • 8-bladed aperture for sunstars
  • 0.25x reproduction ratio
  • Rather compact for what it is
  • Comes with physical aperture ring
Cons
  • Rather long
  • On the heavy side
  • Lacks front filter thread
  • Lacks weather sealing

Price

Offers (incl. referral links)
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