Compare Pentax-DA 645 28-45mm F4.5 vs Fujifilm GF 23mm F4 vs Fujifilm GF 45mm F2.8
Construction
Aperture Blades
9 blades, Rounded blades
9 blades, Rounded blades
9 blades
Colors
Black
Black
Form Factor
Ultra Wide-Angle Prime Lens
Ultra Wide-Angle Prime Lens
Short Telephoto Prime Lens
Image Size
Medium Format (645)
Medium Format (44x33)
Medium Format
Lens Barrel
Distance scale
Physical aperture ring
Physical aperture ring
Lens Mount
Pentax 645 KAF2 bayonet
Fujifilm G-mount
Fujifilm G-mount
Material
Metal
Magnesium alloy
Motor
Linear Motor
Optical Formula | Elements
17 elements
15 elements
11 elements
Optical Formula | Groups
12 groups
12 groups
8 groups
Optical Formula | Special Glass
HD and Aero Bright coatings groups
2 aspherical, 3 extra-low dispersion, 1 super ED groups
One aspherical, two ED elements + Nano GI, fluorine coatings groups
Dimensions
Filter Diameter
82 mm / 3.23 in
82 mm / 3.23 in
62 mm / 2.44 in
Size | Diameter
99 mm / 3.90 in
90 mm / 3.54 in
84 mm / 3.31 in
Size | Length
152 mm / 5.98 in
103 mm / 4.06 in
88 mm / 3.46 in
Weight
1470 g / 51.94 oz
845 g / 29.86 oz
490 g / 17.31 oz
Function
Angle Of View
102.6° Diagonal | 92.1° Horizontal | 69.3° Vertical (wide) ~ 75.6° Diagonal | 65.7° Horizontal | 46.5° Vertical (tele)
99.9° Diagonal
62.6° Diagonal
Aperture
f/4.5 ~ f/32
f/4 ~ f/32
f/2.8 ~ f/32
Autofocus
Yes
Yes
Yes
Crop Factor
0.6
0.8
0.8
Focal Length
28 mm ~ 45 mm
23 mm
45 mm
Focal Length (35mm Equivalent)
17.4 mm ~ 27.9 mm
18 mm
36 mm
Focus Type
Internal
Internal
Internal
Image Stabilization
Yes
No
No
Weather Resistance
Yes
Yes
Yes
Zoom Type
Internal zoom
Performance
Max Magnification
0.21x
0.09x
0.14x
Min Focus Distance
400 mm / 15.75 in
380 mm / 14.96 in
450 mm / 17.72 in
Production
Accessory
Lens Hood: 38709 (supplied)
Lens hood included
Lens hood included
Debut
2014-08-04
2017-04-19
2017-09-07
Reviews
Neofiliac score
68%
80%
71%
Pros
- Superb image quality
- Optically stabilized
- Internal zoom
- Weather-sealed
- Solidly built
- Weather-sealed
- Comes with physical aperture ring
- Very sharp
- Relatively lightweight and compact
- Weather-sealed
- Comes with physical aperture ring
- Well made
Cons
- Dark maximum aperture
- Large and heavy
- Rather expensive
- Quite heavy
- Dark maximum aperture
- Slow autofocus
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