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

Started Mar 8, 2013 | Questions thread
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ultimitsu
ultimitsu Veteran Member • Posts: 6,623
Re: What about The Digital Picture.com tests?

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?

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

dxo messes it up

No they did not.

photozone says -- you can't use their numbers to compare across formats

You misunderstood what photozone meant. What they are saying is you cannot say "Lens EF X which is tested on 5d2 is sharper than Lens EF-S Y which is tested on 50D". Precisely because since Y was tested on 50D it inherently will show less resolution. This goes directly proving Peter's point. There is no discrepancy between DXO and Photozone's view.

but to automatically move the crop camera backward -- when the crop sensor cannot magnify like a lens can -- is just wrong when it comes to comparing across formats

No, you keep saying it is wrong yet you cannot explain why. I already explained to you twice that there is no photo loss due to entropy within 1.6 times distance difference so there is no basis to say it is unfair. You have not provided any counter argument.

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