Canon EF 100-300mm f/4.5-5.6 USM vs Canon EF 75-300mm f/4-5.6 III
Prices & availability
Specification comparison
Highlighted rows differ between the two models.
| Specification | Canon EF 100-300mm f/4.5-5.6 USM | Canon EF 75-300mm f/4-5.6 III |
|---|---|---|
| Mount | ||
| Mount | canon-ef | canon-ef |
| Optics | ||
| Focal (difference) | 100-300 mm | 75-300 mm |
| Aperture (difference) | f/4.5-5.6 | f/4.0-5.6 |
| Prime | No | No |
| Stabilization | No | No |
| Build | ||
| Weight (g) (difference) | — | 480,000 g |
Verdict
Pick Model A if you need the extra 25 mm at the wide end and can accept the slightly dimmer f/4.5 aperture; its USM motor also promises quieter, faster autofocus. Model B stays the better choice if budget is tight, the 75 mm wide end suffices, and you prefer the brighter f/4 aperture at the short end.