Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Mamiya 6 If you have specific requirements

If you have specific requirements for cosmetic condition

with a relatively fast f4 constant aperture throughout the zoom range

plus a pretty respectable f4 maximum aperture throughout the range

Not too fancy

8L II lens

Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Mamiya 6 If you have specific requirementsThe 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