05-29-2011, 12:16 PM
[quote name='wim' timestamp='1306660026' post='8890']
Just one comment as to focus shift with 50L: first of all, one of the people who was most vociferous and had the biggest problems with regard to focus shift on the 50L on POTN, switched to Nikon because of the problems he had with 50L and 1D Mk IV. That lasted a little over a year, when he switched back to Canon, about half a year ago. He recently acquired a new 50L - zero focus shift.
Furthermore, focus shift is/was limited to a very specific range, namely about MFD to 1.8 m, only at apertures from F/1.4 to about F/2.8.
However, it looks like Canon has this problem entirely under control now, and anybody who shoots with a 50L for a while, and likes the 50 mm FL, wouldn't want to miss it.
Same here... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' /> and I tested 5 different specimens over a period of a year and a half, when things were still quite bad. The specimen I still have, which sits as main lens on my 5D II, only had some constant back focus rather than focus shift and was calibrated to perfection by Canon, even if it took Canon a second go to get it perfect.
Other than that, most fast lenses (F/1.4 and faster) show focus shift, unless they have perfect superapochromatic correction. You need to get to know a lens well so you can deal with it, if you are after the rendering such a lens provides.
HTH, kind regards, Wim
[/quote]
i read that the focus shifting problem of the canon 50L was because of how the lens was designed, and to fix this the overall design had to change which would give us a mkII. was that not right?
good news if they found a way to fix this issue, may i know the date code on your 50L, just so that i know which batch doesn't have this issue. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />
Just one comment as to focus shift with 50L: first of all, one of the people who was most vociferous and had the biggest problems with regard to focus shift on the 50L on POTN, switched to Nikon because of the problems he had with 50L and 1D Mk IV. That lasted a little over a year, when he switched back to Canon, about half a year ago. He recently acquired a new 50L - zero focus shift.
Furthermore, focus shift is/was limited to a very specific range, namely about MFD to 1.8 m, only at apertures from F/1.4 to about F/2.8.
However, it looks like Canon has this problem entirely under control now, and anybody who shoots with a 50L for a while, and likes the 50 mm FL, wouldn't want to miss it.
Same here... <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/biggrin.gif' class='bbc_emoticon' alt='
' /> and I tested 5 different specimens over a period of a year and a half, when things were still quite bad. The specimen I still have, which sits as main lens on my 5D II, only had some constant back focus rather than focus shift and was calibrated to perfection by Canon, even if it took Canon a second go to get it perfect.Other than that, most fast lenses (F/1.4 and faster) show focus shift, unless they have perfect superapochromatic correction. You need to get to know a lens well so you can deal with it, if you are after the rendering such a lens provides.
HTH, kind regards, Wim
[/quote]
i read that the focus shifting problem of the canon 50L was because of how the lens was designed, and to fix this the overall design had to change which would give us a mkII. was that not right?
good news if they found a way to fix this issue, may i know the date code on your 50L, just so that i know which batch doesn't have this issue. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />