Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Bronica SQ and motor in the standard

and motor in the standard OM mount

with some dust which will not affect imaging

gimbaled feet keep good contact at any angle

but only a tiny bit- and there's no effect on imaging

Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Bronica SQ and motor in the standardThe Sigma EX 4. 5mm f2. 8 DC HSM is a circular fisheye lens for Canon EF mount cameras. While it's designed for EF S (crop format) cameras, it will also mount to EF mount full frame cameras. Worth noting that this is a fisheye lens so the image it produces is uncorrected for distortion and that, by design, the image does not fill the entire image area, even on EF S cameras. So don't get this lens if you're expecting a normal wide angle lens, because