===== Pentax SMC 85mm f/1.8 ===== 
{{ :lens:pentax_smc_85mm_f1.8.png?250|}}
==== Summary ====
The SMC Pentax 85mm f/1.8 is a manual-focus short telephoto prime introduced in 1975 as part of the original K-series lineup—the first generation of Pentax bayonet-mount lenses. It was produced until 1977, making it a relatively rare and sought-after optic today. Designed primarily for portraiture, it offers a fast f/1.8 aperture in a compact, all-metal body, and is widely praised for its optical clarity, smooth bokeh, and mechanical precision. Optically, the lens features a 6-element, 6-group design with Super Multi-Coating (SMC) and an 8-blade automatic diaphragm, stopping down to f/22. It focuses as close as 85cm, yielding a 0.13× magnification ratio, and uses a 52mm filter thread. The lens weighs 331g, measures 64 × 56mm, and includes a manual aperture ring with no “A” setting—so metering on modern digital bodies requires stop-down operation. There’s no internal focusing, and the front element rotates during focusing, which complicates polarizer use. A dedicated PH-R52 hood and hard case were originally supplied.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |K Series Prime|
| Model           |SMC|
| Focal Length    |85mm|
| Max Aperture    |f/1.8|
| Min Aperture    |f/22|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |85cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |6/6|
| Squeeze         |none|
| Front Diameter  |64mm|
| Filter Thread   |52mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |56mm|
| Weight          |331g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1975 \\
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 ====