The Mamiya RZ 250mm f/4.5 is an unusually compact long telephoto design, with five elements in four groups.
Mamiya lenses are quality controlled at all stages. They are engineered for professional use. Mamiya manufactures its own glass and coats the lens elements using Mamiya's proprietary multi-coating process, increasing light transmission, dramatically reducing flare, and ensuring crisp, clean whites and vibrant natural colors.
| Focal Length | 250 mm |
| Aperture |
Maximum: f/4.5 Minimum: f/45 |
| Camera Mount | Mamiya RZ Mount |
| Angle of View @ Infinity | 20° |
| Minimum Focus Distance | 6.07' (1.85 m) |
| Area of coverage | 297 x 369 mm |
| Groups/Elements | 4/5 |
| Magnification | 0.19x |
| Maximum Reproduction Ratio | 1:5.26 |
| Shutter Type | Sekor Leaf Shutter # 1 |
| Shutter Speeds | 1 / 400 to 8 second |
| Flash Synchronization | At all Speeds |
| DOF Scale | Yes |
| Distance Scale | Yes |
| PC Outlet | Yes |
| Autofocus | No |
| Tripod Collar | No |
| Filter Thread | 77 mm |
| Weight | 2.38 lb (1.08 kg) |
| Dimensions | Approx. 3.8 x 5.00" (9.65 x 12.70 cm) |