===== Pentax Auto-Takumar 35mm f/2.3 =====
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==== Summary ====
The Auto Takumar 35mm f/2.3 is a rare and distinctive wide-angle prime lens produced by Asahi Optical Co. between 1959 and 1962, designed for M42 screw-mount 35mm film cameras. It was one of the fastest wide-angle lenses of its time, featuring a 6-element/5-group optical design, a 10-blade semi-automatic diaphragm, and a maximum aperture of f/2.3—an unusual spec that set it apart from more conventional f/2.8 or f/3.5 offerings. The lens has a minimum focus distance of 45cm, a 62mm filter thread, and weighs approximately 310g, measuring 81mm in length. It lacks internal focusing and uses a manual stop-down mechanism: the aperture closes automatically when the shutter is released but must be reopened manually, a hallmark of early Auto-Takumar lenses. The field of view is 63° diagonal on full-frame, making it suitable for street, documentary, and environmental photography.
==== Tech Specs ====
| Manufacturer |Pentax|
| Series |M42 Series|
| Model |Auto-Takumar|
| Focal Length |35mm|
| Max Aperture |f/2|
| Min Aperture |f/22|
| Format |Full-Frame|
| Image Circle |⌀|
| Minimum Focus |45cm|
| Focus Rotation |°|
| Iris Blades |10|
| Optical Design |6/5|
| Squeeze |none|
| Front Diameter |-|
| Filter Thread |62mm|
| Focus/Zoom Rod |none|
| Native Mount |M42|
| Data Protocol |none|
| Length |81mm|
| Weight |310g|
| Body Telescope |-|
| Body Material |-|
| Focus Drive |-|
| Iris Drive |-|
| Zoom Drive |-|
==== History ====
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Release Date: 1959 \\
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==== Service ====
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==== Cine-Mod ====
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==== Notes ====
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