[mst]

[quote name='Martin_MM' date='13 June 2010 - 01:49 PM' timestamp='1276433353' post='469']

1) Can you say which brand´s lenses have the most sample variation differences?? You have tested extensively hundreds of lenses and I´m sure you have got an idea here. [/quote]



The lensrentals essay gives a rough guidance. IMO the rules of thumb is: higher risk with third party lenses. And (regardless of brand) the more complex the lens, the higher the risk to get a lemon (as Klaus already mentioned above).



The really important conclusion is, though: there is sample variation with all brands.



[quote name='Martin_MM' date='13 June 2010 - 01:49 PM' timestamp='1276433353' post='469']

2) Could you possibly bring a review of sample variations of lets say some of the most used lenses (like 24-70, 70-200/2.8 ?). I´m sure I´m not the only one to be very interested in this!

[/quote]



Nope, sorry. We'd have to test hundreds of copies of a given lens, preferrably from sources distributed around the globe, to produce data that is even remotely reliable.



-- Markus