===== Pentax-M SMC 28-50mm f/3.5-4.5 ===== 
{{ :lens:pentax-m_smc_28-50mm_f3.5-4.5.png?300|}}
==== Summary ====
The SMC Pentax-M 28-50mm f/3.5-4.5 is a compact manual-focus zoom introduced in 1979 for the Pentax K-mount, produced until 1985. It was designed as a lightweight, walkaround lens for film SLRs, offering a modest but useful range from wide-angle to normal. Though it shares its optical formula with the earlier K-series version, the M-series update brought a more compact barrel and styling to match the smaller M-series bodies like the ME Super and MX. Optically, it uses a 10-element, 10-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm, stopping down to f/22–32 depending on focal length. The lens focuses as close as 60cm, offers a 52mm filter thread, and weighs just 310g, measuring 65 × 52mm. It lacks internal focusing or an “A” setting on the aperture ring, so it’s best suited for manual or aperture-priority shooting. The front element rotates during focusing, which complicates polarizer use, and it was typically paired with a PH-R52 clip-on hood and a dedicated hard case.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M Series Zoom|
| Model           |SMC|
| Focal Length    |28-50mm|
| Max Aperture    |f/3.5-4.5|
| Min Aperture    |f/22-32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |60cm|
| Focus Rotation  |°|
| Iris Blades     |6|
| Optical Design  |10/10|
| Squeeze         |none|
| Front Diameter  |65mm|
| Filter Thread   |52mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |52mm|
| Weight          |310g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1979 \\
Launch Price:  \\
Design Revisions:  \\

==== Service ====
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Service Manual: (Insert link to manual here) \\
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Full CLA: **TBD hrs.**\\
<wrap note></wrap>\\
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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 ====