Asahi Fisheye-Takumar 17mm f4 lens mount_Olympus Pen which would normally mean that

which would normally mean that you'd be lucky to cover Micro Four Thirds

with the most notable being on the front retaining ring

While it's technically expired- like all Aerochrome- this stash of 120-format film has been kept refrigerated since purchase and should perform nearly as well as when it was new

it's an Olympus OM-D E-M5: a compact Micro Four Thirds mirrorless camera with a 16mp sensor

but expands to 1

Asahi Fisheye-Takumar 17mm f4 lens mount_Olympus Pen which would normally mean thatThis 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