===== Pentax-M SMC 40-80mm f/2.8-4 ===== 
{{ :lens:pentax-m_smc_40-80mm_f2.8-4.png?250|}}
==== Summary ====
The SMC Pentax-M 40–80mm f/2.8–4 is a compact, manual-focus zoom lens introduced in 1980 and produced until 1984, designed for full-frame K-mount film SLRs. It offers a relatively fast aperture range for its time and a unique focal length span, making it a curious outlier in the Pentax-M lineup. With a 7-element/7-group optical design, Super Multi-Coating (SMC), and a 7-blade automatic diaphragm, it delivers a 57°–30° diagonal field of view on full-frame (or ~40–20° on APS-C), making it suitable for portraiture, short telephoto, and general-purpose photography. The lens features a macro mode at the 80mm end, enabling close focusing down to 37cm (1:4 magnification), though users note it’s more of a close-up mode than true macro. In standard use, the minimum focus distance is 1.2 meters. It uses a 49mm filter thread, weighs 395g, and measures 66 × 76mm. Autofocus is absent, as expected for the era, and there’s no “A” setting on the aperture ring, so it’s best used in manual or aperture-priority modes on modern digital bodies.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M Series Zoom|
| Model           |SMC|
| Focal Length    |40-80mm|
| Max Aperture    |f/2.8-4|
| Min Aperture    |f/22-32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |120cm|
| Focus Rotation  |°|
| Iris Blades     |7|
| Optical Design  |7/7|
| Squeeze         |none|
| Front Diameter  |66mm|
| Filter Thread   |49mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |76mm|
| Weight          |395g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1980 \\
Launch Price:  \\
Design Revisions:  \\

==== Service ====
<nodisp 8>
Service Manual: (Insert link to manual here) \\
\\
Full CLA: **TBD hrs.**\\
<wrap note></wrap>\\
</nodisp>
==== 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 ====