Lens
Clens
EF 400mm f/4 DO IS USM
Full-frame zoom · 1940g
Max Aperture
f/4
Weight
1940g
Min Focus Distance
350cm
Mount: Canon EF — compatible with all Canon EF-mount bodies.
Focus
Autofocus
Mount
Canon EF
Format
35mm full frame
Groups
13
Elements
17
Weight
1940g
Length mm
232.7
Spec Notes
Canon Museum, Dec 2001. Diffractive optics (DO). Rear drop-in filter → filter Mm omitted.
Stabilized
Yes
Diameter mm
128
Max Aperture
f/4
Min Focus Distance
350cm
Aperture Blades
8
Min Focus Basis
Canon: from focal plane
Introduced
2001