![]() That means that the lens isįirst focused at full aperture (for maximum accuracy), then manually stopped down to the ![]() When a mechanical iris lens is mounted on an EOS body, stop down metering must be used. The EOS lens interface is fully electronic and Canon EOS EF and EF-S series lenses are stopped down via electrical signals from the camera For almost all manual focus lenses, this stopping down during exposure is accomplished mechanically via a lever which is moved as the cameras mirror flips up. This gives aīrighter viewfinder image and makes focusing easier and more accurate. Just before exposure, then it stops down for the exposure and opens up again. In addition you don't get any sort of automatic iris operation.Īt full aperture, and if you set the aperture to, say, f11, it remains fully open until Of course you don't get autofocus, nor do you get any sort of focus confirmation unless you use a special adapter with built in electronics. The answer is a qualified "yes" in manyĬases. ![]() Left:Bower fisheye manual focus Center: Vivitar 85/1.4 manual focus Right: Zeiss 21/2.8 manual focusĪ common question from Canon EOS owners is whether older manual focus lenses from other manufacturersĬan be used with a Canon EOS body. Using Manual Focus Lenses on Canon EOS bodies
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