===== Pentax-A 645 SMC 35mm f/3.5 ===== 
{{ :lens:pentax-a645smc35mmf3.5.png?300|}}
==== Summary ====
The SMC Pentax-A 645 35mm f/3.5 is a manual-focus ultra-wide prime introduced in 1986 for the Pentax 645 medium format system, offering a field of view equivalent to roughly 24mm on full-frame. It was the widest prime available for the original 645 lineup and remains a favorite among landscape, architecture, and street photographers for its expansive coverage and classic rendering. Though later replaced by the autofocus FA and HD D FA versions, the A-series model is still prized for its mechanical precision, compact build, and optical character. Optically, it features a 9-element, 8-group design with Super Multi-Coating (SMC) and an 8-blade automatic diaphragm, stopping down to f/22. The lens focuses as close as 30 cm, delivering a 0.25× magnification ratio, and uses a 77mm filter thread. It weighs 470g, measures 80 × 67mm, and includes a manual aperture ring with an “A” setting, enabling full automation on compatible bodies. There’s no internal focusing. A RH-RB screw-in hood and S80-120 soft case were typically bundled.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |Pentax-A|
| Model           |645 SMC|
| Focal Length    |35mm|
| Max Aperture    |f/3.5|
| Min Aperture    |f/22|
| Format          |645 film|
| Image Circle    |-|
| Minimum Focus   |30cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |9/8|
| Squeeze         |none|
| Front Diameter  |80mm|
| Filter Thread   |77mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax 645|
| Data Protocol   |none|
| Length          |67mm|
| Weight          |470g|
| 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 ====