===== Pentax SMC 120mm f/2.8 ===== 
{{ :lens:pentax_smc_120mm_f2.8.png?200|}}
==== Summary ====
The SMC Pentax 120mm f/2.8 is a rare and refined manual-focus telephoto prime introduced in 1975 as part of the original K-series lineup. Produced for only a few years until 1977, it was designed to offer a slightly shorter alternative to the more common 135mm focal length, making it ideal for portraiture, travel, and compressed landscape scenes. Though overshadowed by its M-series successor, the K-version is prized for its optical clarity, mechanical precision, and distinctive rendering. Optically, it features a 5-element, 4-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm, stopping down to f/32. The lens focuses as close as 1.2 meters, delivers a 0.13× magnification ratio, and uses a 52mm filter thread. It weighs 355g, measures 63 × 75mm, and includes a manual aperture ring with no “A” setting—so metering on modern digital bodies requires stop-down operation. A dedicated PH-R52 hood and hard case were originally supplied. In use, the lens is celebrated for its sharpness from f/4 onward, smooth bokeh, and natural color rendering, with many users noting a subtle “3D pop” in well-lit scenes. Wide open at f/2.8, it shows a gentle glow and slightly reduced contrast—ideal for soft portraits—but sharpens dramatically when stopped down. Chromatic aberration is minimal, and distortion is virtually nonexistent. The focus ring is long and silky-smooth, allowing precise manual control, and the build quality is classic K-series: solid metal, engraved markings, and a reassuring heft.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |K Series Prime|
| Model           |SMC|
| Focal Length    |120mm|
| Max Aperture    |f/2.8|
| Min Aperture    |f/32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |120cm|
| Focus Rotation  |°|
| Iris Blades     |6|
| Optical Design  |5/4|
| Squeeze         |none|
| Front Diameter  |63mm|
| Filter Thread   |52mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |75mm|
| Weight          |355g|
| 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: \\
</nodisp>
==== Notes ====
==== Media ====