Return of Interesting article on DxO about 5D III and D800...

Started Apr 10, 2013 | Discussions thread
MAC
MAC
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Re: resolution
In reply to Just another Canon shooter, Apr 14, 2013

Just another Canon shooter wrote:

MAC wrote:

Just another Canon shooter wrote:

schmegg wrote:

When you shoot with equivalent FL's, you do shoot from the same distance.

"Equivalent lenses" is a bit of an oxymoron when you think about it. I can't think of a single pair of 'equivalent' lenses that would be suitable for determining the resolving power of a sensor.

We are not talking about that, whatever that means. The question was why similar lenses perform better in the DXO tests on FF bodies - which they do. The explanation is - DXO measures basically medium contrast, and then FF wins due to less enlargement. The extinct resolution of the sensor plays very little role for that specific metric.

dxo is measuring sharpness, not resolution.

They measure the MTF curve. Then they convert it in some unknown way to their metric.

To do any kind of comparison across formats, one must keep the distance the same.

This is exactly what they do, say with 50mm on crop and 85mm on FF.

?? - are you sure?

One needs a better optic, the farther away from the subject.

Who said anything about being farther away?

they move the crop back with the same prime to get the same fov

Let me repeat what I said:

BTW, the real test should be at equivalent FL and equivalent f-stops with common lenses.

Do you understand that with equivalent FL, the distance will be the same, or not?

I understand equivalence between formats - GB's white paper - the distance must be kept the same.

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