Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Bronica SQ If you're curious about dabbling

If you're curious about dabbling in macro work

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

because number 1 that's not what gorillas look like

7 lens is in an accurate Synchro-Compur shutter

with some dust which will not affect imaging

Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Bronica SQ If you're curious about dabblingThe 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