<p>I figure some may know this already, but this is just good knowledge to keep on spreading.</p>
<p>Basically ef-s lenses only differ from ef lenses due to some additional rubber on the rear end of the ef-s lens. To convert it all you need to do is pull the rubber piece out. Here is what I found on the subject:</p>
<p>Now you can use great ef-s lenses like the 10-22mm on your full frame lenses. With the 10-22mm, however, you don't want to zoom out past 12mm. Seems the 17-55mm ef-s works without a hitch.</p>
Have you thought about using kenko HD 1.4 extender because it supports ef and efs. My thinking is it should work because it will crop 1.4 and that will eliminate the corner.
Dead easy way to convert from EF-S lens to EF. AND BACK!
in Canon EOS Mount
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Have you thought about using kenko HD 1.4 extender because it supports ef and efs. My thinking is it should work because it will crop 1.4 and that will eliminate the corner.