12-06-2011, 08:19 PM
[quote name='mst' timestamp='1323201052' post='13494']
If you suspect it is something actually in the glass (not something that can be wiped away), than a replacement might be the better idea. If it's something in the glass, that element (or several) might need to be exchanged and who knows how the performance/centering will be afterwards. Once it has been to service, replacing the whole lens might no longer be a valid option...
I haven't heard of significant sample variation regarding the 70-200 VR II. However, whatever lens and whatever brand, you'll have to check any individual lens anyway. Even if the risk to get a lemon is low, it's still a risk...
-- Markus
[/quote]
OK, you are right - thank you. The lens will go back.
BTW, does the de-centering test (the template) Klaus posted here http://forum.photozone.de/index.php?/top...nity-check work correctly when printed on A4 paper and shot with a lens from say 1.5m? (which is MFD of the 70-200 anyway...).
If you suspect it is something actually in the glass (not something that can be wiped away), than a replacement might be the better idea. If it's something in the glass, that element (or several) might need to be exchanged and who knows how the performance/centering will be afterwards. Once it has been to service, replacing the whole lens might no longer be a valid option...
I haven't heard of significant sample variation regarding the 70-200 VR II. However, whatever lens and whatever brand, you'll have to check any individual lens anyway. Even if the risk to get a lemon is low, it's still a risk...
-- Markus
[/quote]
OK, you are right - thank you. The lens will go back.
BTW, does the de-centering test (the template) Klaus posted here http://forum.photozone.de/index.php?/top...nity-check work correctly when printed on A4 paper and shot with a lens from say 1.5m? (which is MFD of the 70-200 anyway...).