Lens Models
Lens models are any interchangeable lens that has been marketed
Mamiya Sekor 250mm f/4.5
 Summary |
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|---|---|
| Manufacturer | Mamiya 
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| Model | Sekor 250mm f/4.5 |
| Mount | Mamiya RB67 |
| Marketed | 1970-1974 54 years ago |
 Optics |
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| Zoom |  |
| Focal length | 250mm |
| Aperture | f/4.5-45.0 |
| Closest focus | 2.00m |
| Elements/Groups | 5/4 |
| Diagonal angle of view | 20° |
| Negative size | 6×7 |
| Coating | Single coated |
| Optical diagram |
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 Features |
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| Autofocus | |
| Shutter model | Seiko |
 Physical |
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| Weight | 1510g |
| Filter thread | 77.0mm |
 Misc |
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| Link | https://rb67.helluin.org/lenses/250mm-f4-5/ |
 Meta |
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| Sharing |
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