07-31-2011, 11:36 AM
The MTF numbers can only be compared directly between tests made with the same camera. The LW/PH scaling includes the maximum picture height in pixels, so a camera with a much higher resolution sensor will (usually) achieve much higher maximum LW/PH numbers.
However, the rating that we put next to the graphs can give you a rough guidance to compare lenses tested on different cameras. However, please note that some lenses can behave differently on different sensor (well, it's the sensor that behaves differently, of course) and the sensor size should be roughly the same.
The two tests you're mentioning here are done with two very different sensor sizes. That means that the border and corner measurement spots are a good deal further away from the image center in the FX test, in absolute terms. The relative position of course is the same.
-- Markus
However, the rating that we put next to the graphs can give you a rough guidance to compare lenses tested on different cameras. However, please note that some lenses can behave differently on different sensor (well, it's the sensor that behaves differently, of course) and the sensor size should be roughly the same.
The two tests you're mentioning here are done with two very different sensor sizes. That means that the border and corner measurement spots are a good deal further away from the image center in the FX test, in absolute terms. The relative position of course is the same.
-- Markus
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