Canon EF70-300mm f/4-5.6 IS II USM Instructions Manual page 6

General Precautions
When using the lens with film single-lens reflex camera
The drive speed of the focus lens will be slower than when the lens is used with a digital camera.
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Images will appear out of focus while the camera's internal flash is charging or when zooming during
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exposure for still images.
Even when the camera in <ON>, images may appear out of focus when zooming. If this occurs, press the
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shutter button halfway while zooming.
After focusing in AF mode or AF operation in the ONE SHOT AF mode and zooming by holding the shutter
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button halfway, the camera may indicate that the AF mode has been changed to manual focus (MF) mode.
During continuous shooting, zooming may slow down shooting speed.
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There are some cases when users must wait a few seconds after zooming before the autofocus (AF) will
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function.
When using the lens with film single-lens reflex camera other than the EOS-1V/HS, information may not be
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displayed on the lens information display (p.13-17) even when pressing the shutter button down halfway or all
the way, or when pressing the display mode select button.
When using the lens with certain film single-lens reflex cameras, displaying information on the lens
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information display may cause the autofocus (AF) to stop working. In this case, please shoot after first setting
lens information display to OFF (p.13).
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