| Joined: | Wed Apr 18th, 2012 |
| Location: | United Kingdom |
| Posts: | 4555 |
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I have been trying to avoid this, but it may come to it. It's only a 70-200 APO F2.8 DG EX OS HSM -not necessarily in that order, but I have found the auto focussing strangely variable. The lens seems to work better in the PSAM modes, and manual focussing helps. I have to use my left eye these days!
Not sure why auto focusing as such should be variable.
With some zoom lenses they are (again) set up to an average set point across the zoom range. It’s why I avoided big zoom ranges because if the tele end was sharp, the wide end was often soft (or vice versa). A 3x zoom though didn’t suffer much variance….so shouldn’t be an issue in your case. Is the variability influenced by the fstop being used?
I thought (maybe wrong) the Auto distort firmware was only relevant to Nikon lenses…..perhaps why it was greyed out?
Last edited on Sun Jul 27th, 2025 22:01 by
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Eric