Canon RF 200-800mm F6.3-9 IS USM Instructions Manual page 21

Specifications
The lens length is measured from the lens mount surface to the front end of the lens.
z
Add 24.4 mm/0.96 in. when including the lens cap and dust cap.
The maximum diameter, length and weight listed are for the lens itself only.
z
Close-up Lens 250D/500D cannot be attached because there is no size that fits the lens.
z
All data listed is measured according to Canon standards.
z
Product specifications and appearance are subject to change without notice.
z
ENG-20