Lens Summary
Brand: Pentax
Also Known As: Pentax 645 28-45mm f/4.5
Lens Type: Zoom Lens
Format: Pentax 645 / MF
Focus: Autofocus
Lens Mount: Pentax 645
Release Date: 2014-08-04
MSRP Price: $4999.95
Made in: Japan
Production Status: In Production
Lens Description: The HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens from Pentax provides users of the 645D or 645Z with a weather-resistant, ultra wide-angle zoom lens with a 35mm equivalent focal length of 22-35.5mm. This lens features the 645AF2 mount for electronic aperture control and autofocus with an internal DC motor. Also, it has a constant maximum aperture of f/4.5 throughout its zoom range and uses extra-low dispersion glass elements to limit the effects of chromatic aberrations and improve sharpness. The dustproof and weather-resistant 28-45mm lens features a quick-shift focus system that allows users to quickly switch from auto to manual focus as well as shake reduction image stabilization good for up to approximately 3.5 stops. Further improving image quality is the use of HD and Aero Bright coatings that reduce flare and ghosting. A Super Protect coating on the front element is also utilized to ensure the surface is free of dust and marks.
Pentax HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Specifications
| Lens Specifications | |
|---|---|
| Lens Type | Zoom Lens |
| Focal Length | 28-45mm |
| Mount Type | Pentax 645 |
| Format | Pentax 645 / MF |
| Compatible Format(s) | 645 Medium Format |
| Compatible with Teleconverters | No |
| Maximum Reproduction Ratio | 0.21x |
| Shake Reduction (Image Stabilization) | No |
| Aperture Information | |
| Aperture Ring | No |
| Maximim Aperture | f/4.5 |
| Minimum Aperture | f/32 |
| Maximum Angle of View (APS-C or smaller format) | 89° |
| Minimum Angle of View (APS-C or smaller format) | 63° |
| Optical Information | |
| Lens Elements | 17 |
| Lens Groups | 12 |
| Diaphragm Blades | 9 (Rounded) |
| Extra-Low Dispersion Glass Elements | 2 |
| HD Coating | Yes |
| Super-Multi Coating (SMC) | Yes |
| Fluorine Coating | Yes |
| Focus Information | |
| Focus | Autofocus |
| Built-in Focus Motor | Yes |
| Supersonic Direct-drive Motor (SDM) | Yes |
| Internal Focusing | Yes |
| Minimum Focus Distance | 0.4m |
| Filter Information | |
| Filter Size | 82mm |
| Accepts Filter Type | Screw-on |
| Physical Characteristics | |
| Weather / Dust Sealing | Yes |
| Mount Material | Metal |
| Dimensions | 99 x 151.5mm |
| Weight | 1470g |
| Other Information | |
| Available in Colors | Black |