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Product Overview
Pentax HD Pentax-DA 645 28-45mm F4.5ED AW SR is an ultra wide-angle prime lens for the Pentax 645AF2 bayonet. It covers the 645 medium format image circle. Introduced by Pentax in 2014, it has 17 elements in 12 groups.
Photographers will be pleased by the fact that the lens is internally-zooming, meaning that the barrel does not extend when the focal length is changed. This helps balance and weather sealing; it is also great for long-term durability, as there is less chance for moisture and dirt to get in. For incremental weathers, Pentax is kind enough to include weather sealing.
As an ultra wide-angle prime lens that happens to have relatively small maximum aperture, it is best suited for landscape photography. The built-in image stabilization can be useful for some handheld video work, though one should pay special attention to the corners, which may actually be worse off with the stabilization turned on.
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Ratings
What we found**
Neoscore: 68% (not directly comparable across industries)
Pros
- Superb image quality
- Optically stabilized
- Internal zoom
- Weather-sealed
- Solidly built
Cons
- Dark maximum aperture
- Large and heavy
- Rather expensive
Price Comparison (incl. referral links)*
Specifications
Construction
Aperture Blades
9 blades, Rounded blades
Colors
Black
Form Factor
Ultra Wide-Angle Prime Lens
Image Size
Medium Format (645)
Lens Barrel
Distance scale
Lens Mount
Pentax 645 KAF2 bayonet
Material
Metal
Optical Formula | Elements
17 elements
Optical Formula | Groups
12 groups
Optical Formula | Special Glass
HD and Aero Bright coatings groups
Dimensions
Filter Diameter
82 mm / 3.23 in
Size | Diameter
99 mm / 3.90 in
Size | Length
152 mm / 5.98 in
Weight
1470 g / 51.94 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)
Aperture
f/4.5 ~ f/32
Autofocus
Yes
Crop Factor
0.6
Focal Length
28 mm ~ 45 mm
Focal Length (35mm Equivalent)
17.4 mm ~ 27.9 mm
Focus Type
Internal
Image Stabilization
Yes
Weather Resistance
Yes
Zoom Type
Internal zoom
Performance
Max Magnification
0.21x
Min Focus Distance
400 mm / 15.75 in
Production
Accessory
Lens Hood: 38709 (supplied)
Debut
2014-08-04
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