05-05-2011, 10:06 AM
[quote name='wojtt' timestamp='1304583927' post='8075']
Hmm, what I don't quite understand is why focus shift would matter much in practical use, especially once you know it's an issue to have in mind <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' /> What I mean is that normally you keep acquiring focus on your subject, almost every second, while the aperture change is far less frequent, and then it's like a natural thing to focus, change parameters, refocus, then shoot.. Or am I wrong here ?
[/quote]
There's no right and wrong, just different shooting methodologies. I - for example - always change parameters before I raise the camera to my eye and never re-focus (I use the outer AF points instead. Thus, if I selected an aperture smaller than max e.g. 2.8 for more DoF, then focus shift will be an issue for me. That is, if it's not covered by the increased DoF of course.
Hmm, what I don't quite understand is why focus shift would matter much in practical use, especially once you know it's an issue to have in mind <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' /> What I mean is that normally you keep acquiring focus on your subject, almost every second, while the aperture change is far less frequent, and then it's like a natural thing to focus, change parameters, refocus, then shoot.. Or am I wrong here ?[/quote]
There's no right and wrong, just different shooting methodologies. I - for example - always change parameters before I raise the camera to my eye and never re-focus (I use the outer AF points instead. Thus, if I selected an aperture smaller than max e.g. 2.8 for more DoF, then focus shift will be an issue for me. That is, if it's not covered by the increased DoF of course.