===== Pentax-A* SMC 300mm f/4 ===== 
{{ :lens:pentax-astar_smc_300mm_f4.png?350|}}
==== Summary ====
The SMC Pentax-A* 300mm f/4 is a premium manual-focus telephoto prime lens introduced in 1984 and produced until 1989, part of Pentax’s elite A* (A-Star) series. Designed for K-mount 35mm and full-frame digital SLRs, it features an 8-element/7-group optical formula with ED (Extra-low Dispersion) glass, though this isn’t marked on the lens itself. It offers a constant f/4 aperture, a minimum focus distance of 4 meters, and a maximum magnification of 0.09×—ideal for wildlife, sports, and astrophotography. The lens includes a built-in sliding hood, a 77mm filter thread, and weighs 850g, measuring 84 × 132mm. The 8-blade automatic diaphragm and Super Multi-Coating (SMC) contribute to its smooth bokeh, excellent contrast, and flare resistance.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |A* Series Prime|
| Model           |SMC|
| Focal Length    |300mm|
| Max Aperture    |f/4|
| Min Aperture    |f/32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |400cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |8/7|
| Squeeze         |none|
| Front Diameter  |84mm|
| Filter Thread   |77mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |132mm|
| Weight          |850g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1984 \\
Launch Price:  \\
Design Revisions:  \\

==== Service ====
<nodisp 8>
Service Manual: (Insert link to manual here) \\
\\
Full CLA: **TBD hrs.**\\
<wrap note></wrap>\\
</nodisp>
==== Cine-Mod ====
<nodisp 8>
Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
</nodisp>
==== Notes ====
==== Media ====