Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Mamiya 6 Nikon PB-6D spacers attach between

Nikon PB-6D spacers attach between the rail and the front and rear standards of a Nikon PB-6 bellows

with some dust

plus a pretty respectable f4 maximum aperture throughout the range

Not too fancy

well suited to a 35mm SLR or mirrorless digital camera

Sigma EX 4.5mm f2.8 DC HSM Circular Fisheye for Canon EF-S lens mount_Mamiya 6 Nikon PB-6D spacers attach betweenThe 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