The Pentax DFA M 90mm f/2.8 ED Lens for 645Z offers a 35mm equivalent focal length of approximately 71mm (or approximately 56mm when mounted on a PENTAX 645 film-format camera body). By incorporating two ED (extra-low dispersion) elements and one glass-moulded aspherical element in its optics, the lens assures high-resolution image reproduction over the entire image field, while effectively minimizing chromatic aberration – a problem commonly associated with fast lenses.
The FA 645 90mm lens offers macro photography at a maximum magnification of 0.5X. In close-up applications, its floating mechanism effectively compensates for the curvature of the field to assure sharp, well-defined images.
| Focal Length | 90 mm |
|---|---|
| Lens type | Prime lens |
| Aperture Range | Maximum: f/2.8 Minimum: f/22 |
| Lens mount | Pentax 645, KAF2, 645AF2 |
| Minimum Focusing Distance | 1.36' / 3.45 m |
| Angle Of View | 34 to 42.5° |
| Diaphragm Blades | 9 |
| Filter Size | Front: 67 mm |
| Autofocus | Yes |
| Motor Type | Screw Drive from camera |
| Macro Reproduction Ratio | 0.5x |
| Weight | 1040 g |
| Dimensions (DxL) | Approx. 3.56 x 4.39“ (9 x 11 cm) |
| Magnification | 0.5x |
| Optical Design | 11 Elements in 9 Groups |
| Distance Scale | Yes |
| DOF Scale | Yes |
| Autofocus | Yes |