Dear DPreview either your lens reviews are wrong...

Started Oct 24, 2010 | Discussions thread
Andrew Westlake Senior Member • Posts: 2,928
Re: Dear DPreview either your lens reviews are wrong...

http://www.dpreview.com/learn/?/Glossary/Lens_Reviews/frequently_asked_questions_01.htm

In short:

1) We recently realised that we'd been labelling the MTF scale of the lens widget incorrectly - we were calculating MTF50 in lw/ph, not lp/ph (as the graphs were labeled).* We've corrected the scale, but as a direct consequence the Nyquist line has disappeared.

2) Camera reviews measure the point at which lines on the test chart blur into each other, which isn't the same thing as the MTF50 numbers in the lens reviews, but instead more like MTF10. This is fully expected to give different numbers.

*Obviously this is a rather embarrassing error, and we'd like to apologise to readers for any confusion caused.

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Andy Westlake
dpreview.com

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