===== Pentax-M SMC 50mm f/4 Macro ===== 
{{ :lens:pentax-m_smc_50mm_f4_macro.png?250|}}
==== Summary ====
The SMC Pentax-M 50mm f/4 Macro is a compact, manual-focus macro lens introduced in 1977 and produced until 1984, designed for full-frame K-mount film cameras but fully usable on modern Pentax DSLRs. It features a Tessar-type 4-element/3-group optical design, a 5-blade automatic diaphragm, and Super Multi-Coating (SMC) for improved contrast and flare resistance. With a maximum aperture of f/4 and a minimum aperture of f/32, it’s slower than typical 50mm primes but optimized for flat-field sharpness and close-up work. The lens focuses down to 23cm, delivering 0.45× magnification, and includes engraved reproduction ratios on the barrel—a thoughtful touch for macro shooters. It uses a 49mm filter thread, weighs just 160g, and measures 63 × 42.5mm. The deeply recessed front element often eliminates the need for a hood.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M Series Macro|
| Model           |SMC|
| Focal Length    |50mm|
| Max Aperture    |f/4|
| Min Aperture    |f/32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |45cm|
| Focus Rotation  |°|
| Iris Blades     |5|
| Optical Design  |4/3|
| Squeeze         |none|
| Front Diameter  |63mm|
| Filter Thread   |49mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |42.5mm|
| Weight          |160g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1977 \\
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 ====