===== Pentax-M SMC 135mm f/3.5 ===== 
{{ :lens:pentax-m_smc_135mm_f3.5.png?250|}}
==== Summary ====
The SMC Pentax-M 135mm f/3.5 is a compact manual-focus telephoto prime lens for Pentax K-mount 35mm and full-frame digital SLRs, produced from 1977 to 1986. It features a 5-element/5-group optical design, an 8-blade automatic diaphragm, and Pentax’s Super Multi-Coating (SMC) for improved contrast and flare resistance. With a minimum focus distance of 1.5m and a maximum magnification of 0.11×, it’s well-suited for portraits, nature, and compressed-perspective scenes. The lens includes a built-in retractable hood, a 49mm filter thread, and weighs just 270g in a compact 63 × 66mm all-metal barrel. Its long, smooth focus throw (~270°) allows for precise manual focusing, and it delivers excellent sharpness and color rendering—especially from f/5.6 to f/11. Though often overshadowed by faster or more expensive 135mm lenses, the Pentax-M 135mm f/3.5 is praised for its portability, build quality, and value, making it a favorite among vintage lens enthusiasts and a great match for lightweight shooting kits.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M Series Prime|
| Model           |SMC|
| Focal Length    |135mm|
| Max Aperture    |f/3.5|
| Min Aperture    |f/32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |150cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |5/5|
| Squeeze         |none|
| Front Diameter  |63mm|
| Filter Thread   |49mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |66mm|
| Weight          |270g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1977 \\
Launch Price:  \\
Design Revisions:  \\

==== Service ====
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Service Manual: (Insert link to manual here) \\
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Full CLA: **TBD hrs.**\\
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==== Cine-Mod ====
<nodisp 8>
Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
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==== Notes ====
==== Media ====