===== Pentax Super-Multi-Coated Takumar 20mm f/4.5 ===== 
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==== Summary ====
The S-M-C / Super-Takumar 20mm f/4.5 is a rare and distinctive ultra-wide-angle prime produced by Asahi Optical Co. between 1968 and 1975 for M42 screw-mount cameras. It was one of the widest rectilinear lenses available at the time, offering a dramatic 94° diagonal field of view on full-frame—ideal for landscape, architecture, and creative perspective work.\\
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There are two main versions: 1. The Super-Takumar (1968–1971): 11 elements in 10 groups, 5-blade diaphragm, 58mm filter thread, and a weight of 251g; 2. The Super-Multi-Coated (S-M-C) Takumar (1971–1975): Same optics, but with SMC coatings for improved contrast and flare resistance, and a slightly lighter build at 246g.\\
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Both versions stop down to f/16, focus as close as 20cm, and deliver 0.13× magnification. Due to the bulbous front element, Pentax recommended using 77mm filters with a step-up ring to avoid vignetting, though the native thread is 58mm. A square clip-on hood was included, and the lens shipped in a dedicated hard case.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M42 Series|
| Model           |Super-Multi-Coated Takumar|
| Focal Length    |20mm|
| Max Aperture    |f/4.5|
| Min Aperture    |f/16|
| Format          |Full-Frame|
| Image Circle    |⌀|
| Minimum Focus   |20cm|
| Focus Rotation  |°|
| Iris Blades     |5|
| Optical Design  |11/10|
| Squeeze         |none|
| Front Diameter  |63mm|
| Filter Thread   |58mm|
| Focus/Zoom Rod  |none|
| Native Mount    |M42|
| Data Protocol   |none|
| Length          |45mm|
| Weight          |246g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin: - \\
Release Date: 1971 \\
Launch Price: - \\
Design Revisions:\\

==== Service ====
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Service Manual: (Insert link to manual here) \\
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Full CLA: **#hrs.**\\
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==== Cine-Mod ====
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Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
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==== Notes ====
==== Media ====