The Variable Aperture AE control will not operate, but you can manually adjust the aperture ring of the lens. A basic exposure guide to follow for bright sunlight (with distinct shadows) is to make a fraction representing the shutter speed needed at f / 16 by putting a "one" over the film's ASA rating. With a film of ASA 100, use 1/100 sec.
You can attach extension tube EF12 II or EF25 II for magnified shots. The shooting distance and magnification are shown below. Camera-to-Subject Distance ( mm ) Magnification Near Far Near Far EF 12 II 2893 13449 0.16x 0.03x EF 25 II 2460 6610 0.21x 0.07x
EF400mm f/5.6L USM Other professional features are: a built-in lens hood with locking mechanism, dual manual focusing rings, a removable ring-type tripod mount, full-time manual focusing, and focus range selector for 3.5m to infinity or 8.5m to infinity. Extenders EF 1.4X and EF 2X can be used with manual focusing.
