===== Pentax-A SMC 100mm f/2.8 Macro ===== 
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==== Summary ====
The SMC Pentax-A 100mm f/2.8 Macro is a rare and highly regarded manual-focus macro lens introduced in 1985 and produced until 1989, designed for full-frame K-mount film cameras. It was Pentax’s first 100mm macro to offer a 1:1 reproduction ratio and a bright f/2.8 aperture, making it a standout in the A-series lineup. Optically, it features a 7-element/7-group design, Super Multi-Coating (SMC), and an 8-blade automatic diaphragm, delivering a 24° diagonal field of view on full-frame (or ~16° on APS-C). The lens focuses down to 31cm, achieving true life-size magnification, and uses a 58mm filter thread. It weighs 470g, measures 74 × 93mm, and includes a recessed front element that often eliminates the need for a hood. It has an “A” setting on the aperture ring, enabling full program and shutter-priority automation on compatible Pentax bodies.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |A Series Macro|
| Model           |SMC|
| Focal Length    |100mm|
| Max Aperture    |f/2.8|
| Min Aperture    |f/22|
| Format          |Full-Frame|
| Image Circle    |-|
| Minimum Focus   |31cm|
| Focus Rotation  |°|
| Iris Blades     |8|
| Optical Design  |7/7|
| Squeeze         |none|
| Front Diameter  |74mm|
| Filter Thread   |58mm|
| Focus/Zoom Rod  |none|
| Native Mount    |Pentax K|
| Data Protocol   |none|
| Length          |93mm|
| Weight          |470g|
| 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 ====
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Focus Ring O.D.: -\\
Zoom Ring O.D.: -\\
Iris Ring O.D.: -\\
De-click Y/N: -\\
Additional Notes: \\
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==== Notes ====
==== Media ====