Asahi Fisheye-Takumar 17mm f4  type_Viewfinders Designed for use on Canon

Designed for use on Canon EF-S mount cameras

this is also just about the right size to pack a 4x5 field camera like a Technika or a Graflex

so this might not be the right lens for you if you’re precious about cosmetic condition

and finder

Asahi Fisheye-Takumar 17mm f4 &nbsptype_Viewfinders Designed for use on CanonThis Asahi Fisheye Takumar 17mm f4 is a tiny, tiny full frame fisheye lens pretty unique. This one is in excellent cosmetic condition, with only very light cosmetic wear. Focusing is smooth, diaphragm moves well, and the built in filters are good. Some of the element edges have a variant of "Schneideritis," with some edge of element artifacts; like classic Schneideritis, it's out of the optical path and won't affect imaging, but it's there. A neat