===== Pentax-A* SMC 300mm f/2.8 ED [IF] ===== 
{{ :lens:pentax-astar_smc_300mm_f2.8_ed_if_.png?350|}}
==== Summary ====
The SMC Pentax-A* 300mm f/2.8 ED [IF] is a legendary manual-focus telephoto prime lens introduced in 1984 and produced until 1998, designed for K-mount 35mm and full-frame digital SLRs. It belongs to Pentax’s elite A* (A-Star) series and features an 8-element/8-group optical design with two ED (Extra-low Dispersion) elements and Internal Focusing (IF)—a rarity for its time. With a bright f/2.8 maximum aperture, it excels in low-light, sports, wildlife, and astrophotography, offering a shallow depth of field and creamy bokeh. The lens focuses down to 3 meters, delivers a 0.13× magnification, and includes a built-in sliding hood, tripod collar, and drop-in 43mm rear filter holder. It uses a massive 112 mm front filter, weighs a hefty 2,970g, and measures 133 × 236mm. A more compact alternative was offered in the A* 300mm F4.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |A* Series Prime|
| Model           |SMC|
| Focal Length    |300mm|
| Max Aperture    |f/2.8 ED [IF]|
| Min Aperture    |f/32|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |300cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |8/8|
| Squeeze         |none|
| Front Diameter  |133mm|
| Filter Thread   |112mm, 43mm rear|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |236mm|
| Weight          |2970g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1984 \\
Launch Price:  \\
Design Revisions:  \\

==== 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 ====