| HD Pentax-DA 645 28-45mm F4.5 ED AW SR | |
| Maker: | Ricoh Imaging |
| Mount: | Pentax 645AF2 |
| Focusdrive: | In-lens DC micromotor |
| Feat-Ws: | y |
| Feat-Is: | y |
| Feat-Ar: | n |
| Feat-Mfo: | y |
| Application: | Landscape and architectural photography |
| Type: | z |
| Flength: | 28-45mm |
| Flength-Eq: | 22-35.5mm |
| Aperture: | f/4.5 / f/32 |
| Elements: | 17 |
| Groups: | 12 |
| Diaphragm: | 9 |
| Close-Dist: | 0.4m (01.3feet) |
| Max-Dist: | Infinity |
| Max-Mag: | 0.21 |
| Max-Diameter: | 99mm |
| Weight: | 1470g |
| Filter: | 82mm |
| Hood: | PH-RBC82 |
| Case: | S120-210 |
| Start: | 2014 |
| Msrp: | $4999.95 |
The HD Pentax-DA 645 28-45mm F4.5 ED AW SR is a wide angle zoom lens for the Pentax 645 medium format system, announced by Ricoh on August 4, 2014.