===== Pentax-A* SMC 135mm f/1.8 ===== 
{{ :lens:pentax-astar_smc_135mm_f1.8.png?350|}}
==== Summary ====
The SMC Pentax-A* 135mm f/1.8 is a legendary manual-focus telephoto prime introduced in 1984 and produced until 1989, designed for full-frame K-mount film cameras. It was the fastest 135mm lens ever made by Pentax and one of the fastest in any system, earning its place in the elite “A*” (A-Star) series reserved for Pentax’s most optically ambitious designs. With its f/1.8 maximum aperture, it delivers exceptional subject isolation, low-light performance, and a rendering style that many describe as “painterly.” Optically, it features a 7-element - 6-group design with Super Multi-Coating (SMC) and a 9-blade automatic diaphragm. The lens stops down to f/22, focuses as close as 1.2 meters, and delivers 0.15× magnification. It uses a 77mm filter thread, weighs 865g, and measures 80 × 98mm. It includes a manual aperture ring with “A” setting, a dedicated RH-A77 screw-in hood, and was originally sold with the HE-169B hard case. The lens employs a Fixed Rear Element Extension (FREE) focusing system to maintain optical performance across distances, though it lacks internal focusing or autofocus.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |A* Series Prime|
| Model           |SMC|
| Focal Length    |135mm|
| Max Aperture    |f/1.8|
| Min Aperture    |f/22|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |120cm|
| Focus Rotation  |°|
| Iris Blades     |9|
| Optical Design  |7/6|
| Squeeze         |none|
| Front Diameter  |80mm|
| Filter Thread   |77mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |98mm|
| Weight          |865g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1984 \\
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 ====