Table of Contents
Mamiya-Sekor C Macro 80mm f/4
Summary
Tech Specs
| Manufacturer | Mamiya-Sekor |
| Series | 645 |
| Model | C Macro |
| Focal Length | 80mm |
| Max Aperture | f/4 |
| Min Aperture | f/22 |
| Format | 645 |
| Image Circle | - |
| Minimum Focus | 15 in. |
| Focus Rotation | - |
| Iris Blades | 5 |
| Optical Design | 6 / 4 |
| Squeeze | n/a |
| Front Diameter | n/a |
| Filter Thread | 67mm |
| Focus/Zoom Rod | n/a |
| Native Mount | Mamiya 645 |
| Data Protocol | n/a |
| Length | 3 in. |
| Weight | 585g |
| 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: 6-7 hrs.
The 80mm Macro is much more complicated—even more so than the 35mm and 45mm (both of which have floating group designs)—than any other focal length, so this lens should be quoted the highest of all the focal lengths. The guide keys in the 80mm Macro (there are four) are made of plastic, so take caution.
Spray and bake threads: +1 hrs.
Enter relevant notes here
Haze / separation in doublets
Do not offer to correct. Cost and risk is too high. Replacing with a donor lens/element is recommended.
PL/EF mount conversion
PL or EF mount conversion is available for most Sekor C primes that are in the original Mamiya 645 mount. Conversion not available for lenses with an integrated shutter system or the Mamiya RZ mount system.
Re-anodize exterior: 6-7 hrs + $50/part (typically 5-7 parts)
Most focal lengths may have helical attached to rear housing, if so, additional lapping is required after anodizing. Some Sekor C lenses may have plastic housings. Be careful offering anodizing!
…end of Staff section
Cine-Mod
This section restricted to Duclos Staff users.
Focus Ring O.D.:
Zoom Ring O.D.:
Iris Ring O.D.: (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.
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