Highlighted rows differ between the two models.
| Specification | Canon EF 300mm f/2.8 L IS USM | Canon EF 500mm f/4 L IS USM |
|---|---|---|
| Mount | ||
| Mount | canon-ef | canon-ef |
| Optics | ||
| Focal (difference) | 300 mm | 500 mm |
| Aperture (difference) | f/2.8 | f/4.0 |
| Prime | Yes | Yes |
| Stabilization | Yes | Yes |
Pick Model A if you need the brighter f/2.8 aperture for low-light performance or shallower depth of field, or if the 300mm reach suffices for your subjects. Model B stays the better choice if you prioritize the extra 200mm of focal length for distant subjects and can work with the slightly dimmer f/4 aperture, given the near-identical price.