Asahi Fisheye-Takumar 17mm f4 lens mount_Olympus Pen with the most notable being

with the most notable being on the front retaining ring

The date back requires a CR2025 battery (not included) and presciently only counts dates up to 2019

This F5 is in excellent cosmetic condition

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

film or digital

Asahi Fisheye-Takumar 17mm f4 lens mount_Olympus Pen with the most notable beingThis 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