=====Mamiya-Sekor C N 150mm f/3.5 ===== 
{{ :lens:mamiya-cn-150mmf3.5.png?direct&400|}}
==== Summary ====
==== Tech Specs ====
| Manufacturer    |Mamiya-Sekor|
| Series          |645|
| Model           |C N|
| Focal Length    |150mm|
| Max Aperture    |f/3.5|
| Min Aperture    |f/32|
| Format          |645|
| Image Circle    |-|
| Minimum Focus   |5' / 1.5m|
| Focus Rotation  |-|
| Iris Blades     |6|
| Optical Design  |5 / 5|
| Squeeze         |n/a|
| Front Diameter  |2.55" (hood)|
| Filter Thread   |58mm|
| Focus/Zoom Rod  |n/a|
| Native Mount    |Mamiya 645|
| Data Protocol   |n/a|
| Length          |3.1 in.|
| Weight          |420g|
| 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 ====
<nodisp 8>
Service Manual: (Insert link to manual here) \\
\\
Full CLA: **5-6 hrs.**\\
<wrap note>Enter relevant notes here</wrap>\\
Spray and bake threads: **+1 hrs.**\\
<wrap note>Enter relevant notes here</wrap>\\
Haze / separation in doublets\\
<wrap note>Do not offer to correct. Cost and risk is too high. Replacing with a donor lens/element is recommended.</wrap>\\
PL/EF mount conversion\\
<wrap note>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.</wrap>\\
Re-anodize exterior: **6-7 hrs + $50/part** (typically 5-7 parts)\\
<wrap note>some focal lengths may have helical attached to rear housing, if so, additional lapping is required after anodizing. Sekor C lenses have plastic housings. Be careful offering anodizing!	</wrap>\\
</nodisp>
==== Cine-Mod ====
<nodisp 8>
Focus Ring O.D.: 2.655"\\
Zoom Ring O.D.: \\
Iris Ring O.D.: 2.75" (see notes)\\
De-click Y/N: Yes\\
Additional Notes: \\
<wrap note>Iris gear is possible but not generally recommended since the surface area is very slim and the iris ring on some Sekor C lenses is plastic which can flex. Native mount screw size: M1.7x7mm </wrap>\\
</nodisp>
==== Notes ====
==== Media ====