Tips on Using the Image Stabilizer The Image Stabilizer also operates when the lens is used with extension tube EF12 II or EF 25 II or the extender EF1.4x II or EF 2x II. Pictures may look distorted after being taken depending on the camera, but this doesn't affect shooting. If you set the camera's Custom Function to change the assigned button to operate the AF, the Image Stabilizer will operate when you press the newly assigned AF button.
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.