===== Pentax-A 645 SMC 120mm f/4 Macro ===== 
{{ :lens:pentax-a645smc120mmf4.png?250|}}
==== 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 ====
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==== 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 ====
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Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
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==== Notes ====
==== Media ====