Table of Contents
Mamiya-Sekor C Shift 50mm f/4
Summary
Tech Specs
| Manufacturer | Mamiya-Sekor |
| Series | 645 |
| Model | C Shift |
| Focal Length | 50mm |
| Max Aperture | f/4 |
| Min Aperture | f/32 |
| Format | 645 |
| Image Circle | - |
| Minimum Focus | 1.5' / 0.45m |
| Focus Rotation | - |
| Iris Blades | 6 |
| Optical Design | 10 / 8 |
| Squeeze | n/a |
| Front Diameter | 3.145“ |
| Filter Thread | 77mm |
| Focus/Zoom Rod | n/a |
| Native Mount | Mamiya 645 |
| Data Protocol | n/a |
| Length | 4.2 in. |
| Weight | 735g |
| 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
This section restricted to Duclos Staff users.
Service Manual: (Insert link to manual here)
Full CLA: #hrs.
Enter relevant notes here
…end of Staff section
Cine-Mod
This section restricted to Duclos Staff users.
Focus Ring O.D.: 2.87”
Zoom Ring O.D.:
Iris Ring O.D.: 2.83“
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.
…end of Staff section