Table of Contents
Pentax-A 645 SMC 200mm f/4
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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