Table of Contents
Mamiya-Sekor C 110mm f/2.8
Summary
Tech Specs
| Manufacturer | Mamiya-Sekor |
| Series | 645 |
| Model | C |
| Focal Length | 110mm |
| Max Aperture | f/2.8 |
| Min Aperture | f/22 |
| Format | 645 |
| Image Circle | - |
| Minimum Focus | 4“ / 1.2m |
| Focus Rotation | - |
| Iris Blades | 6 |
| Optical Design | 5 / 5 |
| Squeeze | n/a |
| Front Diameter | 2.36” |
| Filter Thread | 58mm |
| Focus/Zoom Rod | n/a |
| Native Mount | Mamiya 645 |
| Data Protocol | n/a |
| Length | 2.4 in. |
| Weight | 390g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | Manual |
| Iris Drive | Manual |
| Zoom Drive | n/a |
History
Country of Origin: Japan
Release Date:
Launch Price:
Design Revisions:
Service
Cine-Mod
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Focus Ring O.D.: 2.65“
Zoom Ring O.D.:
Iris Ring O.D.: 2.75” (see notes)
De-click Y/N: Yes
Additional Notes:Iris gear is possible but not generally recommended since the surface area is very slim, the gear will cover the stop numbers (unless a custom segmented gear is made and attached via screws into the iris ring) and the iris rings on some Mamiya-Sekor lenses, specifically the C N variants, is plastic, which can flex. Generally, iris rings on the C versions are aluminum, while the iris rings on the C N versions are plastic. The quickest way to distinguish between a C and a C N variant (besides, of course, looking at the engraved serial ring — the C will always be green, while the N will be white) is the texture of the rubber focus grip. If the grip has a diamond texture, it is a normal C version. If the grip has an elongated bar-type pattern, it is a newer C N version.