===== Pentax-A SMC 16mm f/2.8 Fish-Eye ===== 
{{ :lens:pentax-a_smc_16mm_f2.8_fish-eye.png?300|}}
==== Summary ====
The SMC Pentax-A 16mm f/2.8 Fish-Eye is a rare and distinctive ultra-wide-angle prime introduced in 1985 and produced until 2004, designed for full-frame K-mount film cameras. It was the final evolution of Pentax’s diagonal fisheye primes, replacing the earlier K 17mm f/4 and offering a full 180° diagonal field of view with a faster f/2.8 aperture—making it a standout in the A-series lineup. Optically, it features a 9-element - 7-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm. The lens stops down to f/22, focuses as close as 20cm, and delivers 0.15× magnification. It lacks a front filter thread due to its bulbous front element, but includes three built-in filters—Skylight, Yellow (Y2), and Orange (O2)—selectable via a rotating dial. There’s also a rear gelatin filter holder for additional creative control. It weighs 320g, measures 65 × 56mm, and includes a built-in metal hood and dedicated slip-on cap. The “A” setting on the aperture ring allows for full program and shutter-priority automation on compatible bodies.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |A Series Fish-Eye|
| Model           |SMC|
| Focal Length    |16mm|
| Max Aperture    |f/2.8|
| Min Aperture    |f/22|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |20cm|
| Focus Rotation  |°|
| Iris Blades     |6|
| Optical Design  |9/7|
| Squeeze         |none|
| Front Diameter  |65mm|
| Filter Thread   |none (built in filter wheel)|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |56mm|
| Weight          |320g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin:  \\
Release Date: 1985 \\
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: \\
</nodisp>
==== Notes ====
==== Media ====