tag:blogger.com,1999:blog-201871513023262591.post3842441790969833159..comments2023-07-27T08:50:30.721+01:00Comments on BLAB PICTURES - EOS EXPERTS: Back button focusUnknownnoreply@blogger.comBlogger1125tag:blogger.com,1999:blog-201871513023262591.post-45781860441972303812009-03-13T11:18:00.000+00:002009-03-13T11:18:00.000+00:00I've been using this technique for a while now on ...I've been using this technique for a while now on the EOS 30D, swapping the AE-lock for focus instead. It works very well and has improved my focus accuracy massively. (It much reduces the chance of the auto focus bouncing onto some other target.)<BR/><BR/>The slight problem comes with the 50D. The 50D, like the 40D, has the AF-on button, which is great, right up until you use it with a battery grip. No AF-on button on the grip. Okay, so then you go into the custom functions and select to swap the operation of the AF-on button and the AE-lock button, which at least gives you focus back on the grip.<BR/><BR/>Sadly this also messes up the zoom controls when reviewing pictures because it swaps all functions for the buttons. So now to zoom out of images on the 50D I have to press the AF-on button which is a nuisance. If I press the AE-lock button, the camera drops out of review mode, which is annoying.<BR/><BR/>The 30D didn't have this issue because if you assigned focus to the AE-lock button, it didn't change it's function in review mode. I wish the 50D had been the same - or Canon had put an AF-on button on the grip.<BR/><BR/>In the end, for the 50D and grip I'm persisting with separating the focus from the shutter release - it is a nice way of working. Just occasionally I'll drop out of review by mistake and wonder what on earth Canon were thinking.Anonymousnoreply@blogger.com