===== Pentax-A 645 SMC 200mm f/4 =====
{{ :lens:pentax-a645smc200mmf4.png?200|}}
==== Summary ====
The SMC Pentax-A 645 200mm f/4 is a manual-focus telephoto prime introduced in the mid-1980s for the Pentax 645 medium format system. With a 35mm equivalent focal length of approximately 124mm, it was designed as a lightweight, affordable option for portraiture, landscape, and compressed-perspective work—slotting in between the more common 150mm and 300mm lenses in the lineup. Optically, it features a 4-element - 4-group design with Super Multi-Coating (SMC) and an 8-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 2 meters, and delivers a 0.13× magnification ratio. It uses a 58mm filter thread, weighs 570g, and measures 74 × 116mm. It includes a built-in sliding hood, a manual aperture ring with “A” setting, and was typically sold with the S80-160 soft case. It lacks internal focusing, weather sealing, or autofocus, but is fully compatible with all Pentax 645 film and digital bodies.
==== Tech Specs ====
| Manufacturer |Pentax|
| Series |Pentax-A|
| Model |645 SMC|
| Focal Length |200mm|
| Max Aperture |f/4|
| Min Aperture |f/32|
| Format |645 film|
| Image Circle |-|
| Minimum Focus |140cm|
| Focus Rotation |°|
| Iris Blades |8|
| Optical Design |4/4|
| Squeeze |none|
| Front Diameter |74mm|
| Filter Thread |58mm|
| Focus/Zoom Rod |none|
| Native Mount |Pentax 645|
| Data Protocol |none|
| Length |116mm|
| Weight |570g|
| Body Telescope |-|
| Body Material |-|
| Focus Drive |-|
| Iris Drive |-|
| Zoom Drive |-|
==== History ====
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==== Service ====
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==== Cine-Mod ====
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