Highlighted rows differ between the two models.
| Specification | Canon EF 100-400mm f/4.5-5.6 L IS USM | Sigma 50-500mm f/4.5-6.3 APO DG OS HSM - Monture Canon EF |
|---|---|---|
| Mount | ||
| Mount | canon-ef | canon-ef |
| Optics | ||
| Focal (difference) | 100-400 mm | 50-500 mm |
| Aperture (difference) | f/4.5-5.6 | f/4.5-6.3 |
| Prime | No | No |
| Stabilization | Yes | Yes |
Pick Model A if you prioritize a more consistent maximum aperture (f/5.6 at 400mm) and a lighter, more compact build for handheld telephoto shooting. Model B stays the better choice if you need the extra reach (500mm) and wider starting focal length (50mm) at a lower price, accepting the dimmer f/6.3 aperture at the long end.