Canon EF 400mm f/4 DO IS II USM vs Canon EF 800mm f/5.6 L IS USM
Prices & availability
Specification comparison
Highlighted rows differ between the two models.
| Specification | Canon EF 400mm f/4 DO IS II USM | Canon EF 800mm f/5.6 L IS USM |
|---|---|---|
| Mount | ||
| Mount | canon-ef | canon-ef |
| Optics | ||
| Focal (difference) | 400 mm | 800 mm |
| Aperture (difference) | f/4.0 | f/5.6 |
| Prime | Yes | Yes |
| Stabilization | Yes | Yes |
Verdict
Pick Model A if you need a brighter f/4 aperture for low-light shooting or faster autofocus, or if portability matters—its 400 mm reach and lower price make it the practical choice for most users. Model B stays the better choice if you absolutely require the extra 800 mm reach and can accept the dimmer f/5.6 aperture, despite its significantly higher cost.