06-07-2010, 11:00 AM
[quote name='Klaus' date='03 June 2010 - 09:02 PM' timestamp='1275598966' post='157']
"Residual spherical aberrations" - the lens suffers from focus shifts when stopping down.
The focus information is obtained at max. aperture so it's slightly off at other settings. At close focus distances this is a relevant problem.
RSAs are not so uncommon in this class.
[/quote]
Apparently mine had focus shift even wide open. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='
' /> In fact, I sold it just because it was so annoying. Even calibration didn't work. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='
' />
Happy shooting,
Yakim.
"Residual spherical aberrations" - the lens suffers from focus shifts when stopping down.
The focus information is obtained at max. aperture so it's slightly off at other settings. At close focus distances this is a relevant problem.
RSAs are not so uncommon in this class.
[/quote]
Apparently mine had focus shift even wide open. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='
' /> In fact, I sold it just because it was so annoying. Even calibration didn't work. <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/sad.gif' class='bbc_emoticon' alt='' />Happy shooting,
Yakim.