Fast ultra-wide Irix 15mm f/2.4 for Canon EF, exceptional astrophotography lens with infinity focus click.
The Irix 11mm f/4 Firefly is already the Canon EF sibling — the Irix 15mm f/2.4 Firefly is a moderately ultra-wide manual-focus prime for the Canon EF mount. Firefly = standard aluminum barrel (vs the Blackstone's metal construction). Canon EF mount.
f/2.4 maximum aperture. 15mm focal length (full-frame ultra-wide, approximately 110° diagonal field of view). Manual focus. At approximately 390g. Canon EF mount.
The Irix 15mm f/2.4 is used for landscape, astrophotography, and architectural photography — f/2.4 at 15mm provides good light gathering for star photography. The Firefly version uses a lighter aluminum barrel than the heavier Blackstone model.
On the used market the Irix 15mm f/2.4 Firefly Canon EF is a capable ultra-wide prime. Condition checks: front element (exposed), focus ring. Canon EF mount — manual focus.