===== Pentax-A 645 SMC 150mm f/3.5 ===== 
{{ :lens:pentax-a645smc150mmf3.5.png?350|}}
==== Summary ====
The SMC Pentax-A 645 150mm f/3.5 is a manual-focus short telephoto prime introduced in the mid-1980s for the Pentax 645 medium format system. With a 35mm equivalent focal length of approximately 90-96mm, it was designed as a compact, affordable portrait and landscape lens—slotting neatly between the 120mm macro and the longer 200mm telephoto options. 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 1.4 meters, and delivers a 0.15× magnification ratio. It uses a 58mm filter thread, weighs around 435g, and measures 74 × 71.5mm. It includes a built-in sliding metal hood with a rubber bumper, a manual aperture ring with “A” setting, and was typically sold with the S80-120 soft case. There’s no internal focusing or weather sealing, but the front element does not rotate—making it friendly for polarizer use.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |Pentax-A|
| Model           |645 SMC|
| Focal Length    |150mm|
| Max Aperture    |f/3.5|
| 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          |71.5mm|
| Weight          |435g|
| 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 ====
<nodisp 8>
Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
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==== Notes ====
==== Media ====