===== ZERØ OPTIK Leica Summicron-M 90mm T2.1 ===== 
{{ :lens:20260902_143112.png?direct&250|}}
==== Summary ====
Thoroughly modern glass with beautiful separation, Leica’s current M-mount aspherical lenses provide excellent image consistency and performance that many film projects require while lending the smooth focus and character of an older lens. And they do it with consistently fast stops—high speed from 21mm to 90mm with even faster 50 and 75mm focal lengths. As a result these Leicas effectively harness ultra thin depth of field with perfect texture.
==== Tech Specs ====
| Manufacturer    |ZERØ OPTIK|
| Series          |Leica|
| Model           |M0.8/M|
| Focal Length    |90mm|
| Max Aperture    |T2.1|
| Min Aperture    |T22|
| Format          |S35, FL|
| Image Circle    |⌀|
| Minimum Focus   |2ft|
| Focus Rotation  |°|
| Iris Blades     |16|
| Optical Design  |-|
| Squeeze         |none|
| Front Diameter  |95mm|
| Filter Thread   |none|
| Focus/Zoom Rod  |none|
| Native Mount    |LPL|
| Data Protocol   |none|
| Length          |-|
| Weight          |-|
| Body Telescope  |none|
| Body Material   |aluminum|
| Focus Drive     |manual|
| Iris Drive      |manual|
| Zoom Drive      |none|
==== History ====
Country of Origin: - \\
Release Date: - \\
Launch Price: - \\
Design Revisions:\\
==== Service ====
<nodisp 8>
Service Manual: [[staff:servicedb:ZeroOptikLeicaMModern|Disassembly/Re-assembly]]\\
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Full CLA: **5-6 hrs.**\\
<wrap note>Has larger, Cooke-sized follower (x1).</wrap>\\
Re-align optics: **#hrs.**\\
<wrap note>There are **x4** centering set screws located at the rear group, **__however__**, it is impossible to access them with the optical assembly installed in the lens chassis and adjust in real time on the projector. Centering would either need to be done on the vertical collimator with the optical assembly removed from the chassis, or you can have the empty chassis mounted on the projector, adjust the set screws (push on the same side of the flare), then slip the optical assembly into the chassis to check.</wrap>\\
</nodisp>
==== Notes ====
==== Media ====