Sigma's circular fisheye for Canon APS-C — a 4.5mm producing full circular images on crop sensors.
The Sigma 4.5mm f/2.8 Fisheye EX DC HSM is a circular fisheye lens for APS-C cameras — 4.5mm produces a circular image within the frame on APS-C sensors. Canon EF mount.
4.5mm focal length. f/2.8 maximum aperture. Circular fisheye (APS-C). EX class. DC = APS-C. HSM autofocus. Canon EF mount.
The Sigma 4.5mm f/2.8 Fisheye produces a circular (not full-frame) fisheye image on APS-C sensors — the 180-degree circular field fills a circle within the frame, with black corners outside. A specialist creative lens popular for skateboarding, VR-style photography, and artistic work. Not to be confused with full-frame fisheyes like the 8mm or 15mm variants.
On the used market the Sigma 4.5mm f/2.8 Fisheye is a specialist circular fisheye. Condition checks: circular fisheye element (fragile, no front filter thread), HSM. Canon EF mount.