This flat "pancake" Fish-Eye-Takumar 17mm F11 lens has fixed focus, a field of view of 180 degrees, and covers the full 24x36mm format.
The diaphragm is a perforated disc with perfectly circular openings.
This was the first fisheye lens from Pentax, and also the first fisheye lens to become available in M42 mount. The Takumar 17mm F11 was quickly replaced by the 18mm F11 in 1963.
We have no official information available from Pentax on this lens so the information presented here is third hand. Some collectors doubt that this lens was ever manufactured. If you have a picture of the lens or official information please contact a forum administrator.
Notes
The diaphragm is a perforated disc with perfectly circular openings. We have no official information available from Pentax on this lens so the information presented here is third hand. It is even doubtful if this lens was ever produced.
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