Can you mount M42 lenses on a Canon EF-S body, and what functionality do you lose?
Asked 1/13/2011
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I have a Canon EOS Rebel XTi with an EF-S mount and want to use a Pentax M42 screw-mount lens. Is there an M42-to-EF adapter that works on this camera? If so, what functions will I lose compared with a native Canon EF/EF-S lens?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
15y ago
2 Answers
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You can use an adapter to mount a lot of lenses to a Canon EOS body, due to the short flange distance.
You will lose auto-focus, and the camera cannot set the aperture of the lens when taking the shot.
That means you will have to focus manually, and meter by stopping down.
Here's a good introduction to using non-EF mounts on modern Canon cameras.
Originally by user3114. Source · Licensed CC BY-SA 4.0
user3114
15y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. An M42 screw-mount lens can be used on a Canon EF-S DSLR like the XTi with an M42-to-EF adapter.
What you lose:
- autofocus: M42 lenses will be manual focus only
- electronic aperture control: the camera cannot set the lens aperture
- usually focus confirmation, unless you use a special adapter that provides it
In practice, you’ll set focus manually and meter with the lens stopped down. Because Canon EOS bodies have a relatively short flange distance, adapting many older lenses is straightforward.
One extra note: M42 lenses are generally fine on EF-S/crop Canon bodies, but some adapted lenses that work on crop bodies may interfere with the mirror on certain full-frame Canon DSLRs.
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