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

Started Mar 8, 2013 | Questions thread
Mako2011
Mako2011 MOD
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In reply to qianp2k, Mar 12, 2013

qianp2k wrote:

MAC wrote:

ultimitsu wrote:

MAC wrote:

we're talking equivalence across formats . Did you read GB's white paper. The distance from the sensor to the subject when comparing across formats must remain the same.

who is this and what authority does this person hold?

Great Bustard has been with the forum a long time and wrote a great white paper over a long period of time. You were in the thread - see link below. Do you challenge this excellent equivalence white paper? If so, why? I'm sure those of us who agree with Great Bustard on the distance parameter being held the same would like to hear why?

http://forums.dpreview.com/forums/post/51012476

it's maybe your bible but I count on DXOMark, DPR, Photozone, etc

That may be your Achilles heal. You don't check their data and run the numbers are even actually compare equivalent photos. Many a a well intentioned person has fallen victim to that your methodology. Not uncommon. Very understandable, that's' what advertisers count on.

now we introduce an even more complex subject -- resolution of systems across formats.

dxo messes it up

No they did not.

so you've unfairly penalized crop as well by moving the crop sensor farther away

Sigh. Do you understand if you shoot from the same distance between you/camera and subject (a resolution chart for example), 15mm on 7D has the same AOV of 24mm on 5D? Where the moving crop sensor farther away is from?

Again, not a proper comparison across formats for the variables you're trying to actually compare. Photozone agrees.


I believe DXOMark and Photozone got both right, and the vast real world photos vividly prove that.

What they got right is not what your suggesting they compared.

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