Table of Contents
Pentax-A 645 SMC 120mm f/4 Macro
Summary
The SMC Pentax-A 645 120mm f/4 Macro is a manual-focus macro lens introduced in the mid-1980s for the Pentax 645 medium format system. It delivers true 1:1 magnification without extension tubes, making it a standout for close-up, product, and nature photography. It also doubles as a sharp short telephoto for portraits and general use. It features a 9-element - 7-group optical design, Super Multi-Coating (SMC), and an 8-blade automatic diaphragm. The lens stops down to f/32, focuses as close as 39cm, and provides life-size reproduction. It uses a 67mm filter thread, weighs 695g, and measures 78.5 × 110mm. It includes an A setting on the aperture ring for full automation on compatible 645 bodies. A MH-RA 67 mm screw-in hood and S80-160 soft case were standard accessories.
Tech Specs
| Manufacturer | Pentax |
| Series | Pentax-A |
| Model | 645 SMC |
| Focal Length | 120mm |
| Max Aperture | f/4 Macro |
| Min Aperture | f/32 |
| Format | 645 film |
| Image Circle | - |
| Minimum Focus | 39cm |
| Focus Rotation | ° |
| Iris Blades | 8 |
| Optical Design | 9/7 |
| Squeeze | none |
| Front Diameter | 78.5mm |
| Filter Thread | 67mm |
| Focus/Zoom Rod | none |
| Native Mount | Pentax 645 |
| Data Protocol | none |
| Length | 110mm |
| Weight | 695g |
| Body Telescope | - |
| Body Material | - |
| Focus Drive | - |
| Iris Drive | - |
| Zoom Drive | - |
History
Country of Origin:
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Service
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Service Manual: (Insert link to manual here)
Full CLA: TBD hrs.
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Cine-Mod
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Focus Ring O.D.: -
Zoom Ring O.D.: -
Iris Ring O.D.: -
De-click Y/N: -
Additional Notes:
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