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IQ of 7d w 15-85mm Vs 6d w 24-105mm?

Started Mar 8, 2013 | Questions thread
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technic Veteran Member • Posts: 8,932
Re: new term

Mako2011 wrote:

You have said that over and over but still can't point to what measurements actually go into it. Seems like they simply tried to make up a new term to compete with SQF (Subjective Quality Factor). P-MPix did change results...look at the D7K data.

and obviously it is NONSENSE to aggregate the test results of a complex lens design where performance varies depending on many factors in just one number (factors: focal length, focus distance, aperture, position in the frame, reflections/light sources etc.). People who believe such numbers don't understand anything about lenses and image quality. Every lens is a compromise, and people have different priorities.

e.g. I'm interested in corner sharpness, because I hate soft corners on landscape images and the 24-105 seems to have plenty of that near wide open (in the corners). What does DXO tell me about that, how it compares to the corners of the 15-58? Absolutely nothing. What does TDP tell me about that? VERY little, only some comparison at a certain focus setting and with a test chart - pretty irrelevant for normal use.

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