===== Pentax SMC Takumar 15mm f/3.5 ===== 
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==== Summary ====
The SMC Takumar 15mm f/3.5 is an ultra-wide-angle manual-focus prime introduced in 1975 for the M42 screw mount, making it one of the last Takumar lenses before Pentax transitioned fully to the K-mount system. It was a groundbreaking design at the time—one of the first rectilinear 15 mm lenses for 35mm film—and is optically identical to the early K-series version. A limited number of units (around 900 total, with 400 featuring an aspherical element) were produced, making it one of the rarest and most collectible Takumars ever made. The lens features a 13-element - 12-group design with Super Multi-Coating (SMC) and a 6-blade automatic diaphragm. It stops down to f/22, focuses as close as 30cm, and delivers a 0.06× magnification ratio. It has a built-in hood, a dedicated hard case, and uses internal rear-mounted filters (Skylight, UV, Yellow Y2, Orange O2) due to its massive, bulbous front element. The lens measures 80 × 81.5mm, weighs 570g, and includes open-aperture metering support on compatible Spotmatic bodies like the ES and ESII.
==== Tech Specs ====
| Manufacturer    |Pentax|
| Series          |M42 Series|
| Model           |SMC Takumar|
| Focal Length    |15mm|
| Max Aperture    |f/3.5|
| Min Aperture    |f/22|
| Format          |Full-Frame|
| Image Circle    |⌀|
| Minimum Focus   |30cm|
| Focus Rotation  |°|
| Iris Blades     |6|
| Optical Design  |13/12|
| Squeeze         |none|
| Front Diameter  |80mm|
| Filter Thread   |Built-in|
| Focus/Zoom Rod  |none|
| Native Mount    |M42|
| Data Protocol   |none|
| Length          |81.5mm|
| Weight          |570g|
| Body Telescope  |-|
| Body Material   |-|
| Focus Drive     |-|
| Iris Drive      |-|
| Zoom Drive      |-|
==== History ====
Country of Origin: - \\
Release Date: 1975 \\
Launch Price: - \\
Design Revisions:\\

==== Service ====
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Service Manual: (Insert link to manual here) \\
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Full CLA: **#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 ====