Canon 24-70mm Canon 70-200mm
Hello,
Posted in the heading is the 2 lenses I use with the Canon 5D MarkII. Whenever I focus the very first thing I do is zoom in on the subject, 70mm with the 24-70 and 200mm with the 70-200, I then focus and then I zoom back to the focal length I wish to shoot with and then begin photographing. I never focus from 24mm or 35mm or 135mm etc. It is always from the furthest focal length possible with each lens. Now if purchase lens align and it sets the alignment to 70mm with the 24-70 and 200mm with the 70-200mm, (assuming that my lens are somewhat out of alignment) by the method that I focus with, won't lens align improve ALL of my focal lengths? It may sound like an obvious question but I would like to know if I am missing anything here. Thanks!
Nathan Anderson
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Support Staff 2 Posted by Michael Tapes Design on 21 Feb, 2012 03:12 PM
Hi Nathan,
Yes you are missing one thing. When focusing at 200mm, then zooming to 70mm there is no assurance that the focus will be correct. Zoom lenses just do not work that way. That is why you do not see this technique discussed. It may work OK at smaller apertures where there is greater DOF to cover the inaccuracy, but this is not a proper technique for any zoom lens. I can see why the conclusion regarding LensAlign, but you are working with a flawed premise.
Sorry...no free lunch :>)
Michael Tapes Design closed this discussion on 21 Feb, 2012 03:12 PM.