05-05-2011, 11:15 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]
I think so. You miss that the camera does not focus at the desired aperture, but always with the lens' aperture wide open. The focus shift then occurs only when taking the shot.
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]
I think so. You miss that the camera does not focus at the desired aperture, but always with the lens' aperture wide open. The focus shift then occurs only when taking the shot.