===== Pentax-A 645 SMC 300mm f/4 ED [IF] ===== 
{{ :lens:pentax-a645smc300mmf5.6efid.png?400|}}
==== Summary ====
The SMC Pentax-A 645 300mm f/4 ED [IF] is a premium manual-focus telephoto lens for the Pentax 645 medium format system, renowned for its sharpness, build quality, and internal focusing design. Introduced as part of Pentax’s elite A* series, the SMC Pentax-A* 645 300mm f/4 ED [IF] was designed to deliver professional-grade performance for medium format photographers. It features a 300mm focal length, equivalent to approximately 200mm in 35mm terms, making it ideal for wildlife, sports, landscape, and telephoto portraiture. The lens uses an 8-element, 8-group optical formula, including Extra-low Dispersion (ED) glass, which minimizes chromatic aberration and enhances clarity and contrast. The Super Multi-Coating (SMC) further improves flare resistance and color fidelity.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |Pentax-A|
| Model           |645 SMC|
| Focal Length    |300mm|
| Max Aperture    |f/4 ED [IF]|
| Min Aperture    |f/32|
| Format          |645 film|
| Image Circle    |-|
| Minimum Focus   |300cm|
| Focus Rotation  |°|
| Iris Blades     |-|
| Optical Design  |8/8|
| Squeeze         |none|
| Front Diameter  |93mm|
| Filter Thread   |77mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax 645|
| Data Protocol   |none|
| Length          |208mm|
| Weight          |1360g|
| 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 ====