The previously rumored Pentax HD DA 645 28-45mm f/4.5 ED AW SR wide-angle medium format zoom lens was briefly listed on B&H's website. The page is now removed, but you can still find the cashed version. Here are the lens specifications:
- Aperture range from f/4.5 to f/32
- Pentax 645AF2 Mount
- 22-35.5mm (35mm Equivalent)
- Aperture Range: f/4.5 to f/32
- Extra-Low Dispersion Elements
- DC AF Motor & Quick-Shift Focus System
- Super Protect, HD & Aero Bright Coatings
- Dustproof and Weather-Resistant
- Nine Blade Circular Diaphragm
- Filter Thread: 82mm
- Pentax 645AF2 mount for full electronic aperture control and autofocus with an internal DC motor
- Lens construction features 17 elements in 12 groups
- Maximum magnification of 0.21x
- Built-in shake reduction technology provides about 3.5 stops of image stabilization
- Nine rounded diaphragm blades provide a circular aperture from f/4.5-6.3 at 28mm and from f/4.5-8 at 45mm
- Minimum focusing distance of 1.3'
| Focal Length | 28 - 45 mm |
| Aperture | Maximum: f/4.5 Minimum: f/32 |
| Camera Mount | Pentax 645 |
| Angle of View @ Infinity | 89° - 63° |
| Minimum Focus Distance | 1.31' (.4 m) |
| Diaphragm Blades | 9 |
| Elements/Groups | 17/12 |
| Magnification | 0.21x |
| DOF Scale | No |
| Distance Scale | Yes |
| Autofocus | Yes |
| Tripod Collar | No |
| Movements | None |
| Filter Thread | Front: 82 mm |
| Weight | 3.24 lb (1.47 kg) |
| Dimensions | Approx. 3.90 x 5.96" (99 x 151.5 mm) |
Via Digicame-info
