John Sheehy wrote in post #19164638
It would be interesting to know what the IBIS performance is like, given that many older Sigma lenses give the wrong lens info to the camera, yielding wildly wrong IBIS parameters. Do you know if the Canon 2xIII fits inside of it?
It is interesting that the front element is 1.4x the entrance pupil size. Most primes of that focal length have front elements just barely larger than the entrance pupil.
It fits, but only if the focus is close to the MFD. So I guess you could use it for macro with one of those mechanical focusing systems that move the entire camera? Not sure, I'm just getting started on macro. At any rate, here is a shot I took with the combo just now. It was on a small tripod in "monopod mode", i.e., I got tired of moving the tripod around and was balancing on two legs as I positioned the shot. Needless to say, it was in manual focus mode. The IBIS symbol does come up and EXIF does call out the Sigma 105, though it doesn't seem to indicate the presence of the Canon 2x III.
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