===== Pentax SMC 500mm f/4.5 =====
{{ :lens:pentax_smc_500mm_f4.5.png?400|}}
==== Summary ====
The SMC Pentax 500mm f/4.5 is a manual-focus super-telephoto prime lens introduced in 1975 and produced through the 1980s, designed for full-frame K-mount film cameras. It was the longest fixed-focal-length lens in the original K-series lineup (excluding mirror lenses), based on the earlier Takumar 500mm f/4.5 design. With a 4-element/4-group optical formula, 10-blade manual diaphragm, and Super Multi-Coating (SMC), it delivers a 5° diagonal field of view on full-frame—ideal for wildlife, sports, and astronomical photography. The lens features a manual aperture ring (no “A” setting), a minimum aperture of f/45, and a minimum focus distance of 10 meters, which can be halved with extension tubes. It uses rear-mounted 52mm drop-in filters, includes a built-in sliding hood, and ships in a dedicated hard case. It weighs a hefty 3370g, measures 126 × 400mm, and includes a tripod collar for stability.
==== Tech Specs ====
| Manufacturer |Pentax|
| Series |Prime|
| Model |SMC|
| Focal Length |500mm|
| Max Aperture |f/4.5|
| Min Aperture |f/45|
| Format |Full-Frame|
| Image Circle |-|
| Minimum Focus |1000cm|
| Focus Rotation |°|
| Iris Blades |10|
| Optical Design |4/4|
| Squeeze |none|
| Front Diameter |126mm|
| Filter Thread |52mm (rear)|
| Focus/Zoom Rod |none|
| Native Mount |Pentax K|
| Data Protocol |none|
| Length |400mm|
| Weight |3370g|
| Body Telescope |-|
| Body Material |-|
| Focus Drive |-|
| Iris Drive |-|
| Zoom Drive |-|
==== History ====
Country of Origin: \\
Release Date: 1975 \\
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==== Service ====
Service Manual: (Insert link to manual here) \\
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Full CLA: **TBD hrs.**\\
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==== Cine-Mod ====
Focus Ring O.D.: -\\
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Iris Ring O.D.: -\\
De-click Y/N: -\\
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==== Notes ====
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