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

Started Mar 8, 2013 | Questions thread
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Re: 24-105mm rated 50% better than 15-85 at dxo
In reply to MAC, Mar 12, 2013

MAC wrote:

ultimitsu wrote:

MAC wrote:

When one buys a 5d2, don't they expect 21 MPix?

Only with perfect lens. When you buy Porsche you do not expect to be able to drive 280kph on all roads do you? only on very smooth roads or race tracks.

They get perfect 21 when they use $6800 300 f2.8 IS.

They get 12 on a 5dii -- which sucks -- when they use $800 24-105

that is the reality, there is nothing "sucks about it". 12mp is still more than you can get from 15-85 from 18mp apsc.

Fundamental Principle -- a photographer cannot be in two places at the same time -- particularly in pj shooting scenarios. Measurement comparisons across formats need to have the photographer standing in the same position photographing the target at the same distance.

whats this got to do with resolution testing? it is like saying same car cannot be at two different road at the same time so we ought not to compare how well it drives on them?

It is intuitive. Moving further away -- in general, takes a better, more expensive optic to display the same resolution.

And with crop sensor you HAVE to move further away because you do not have enough sensor to cover the scene. This is exactly how it ought to be.

Why would we allow the sensors to be placed further away across different formats to compare.

because you do not have enough sensor to cover the scene. This is exactly how it ought to be.

dxo is really going to confuse buyers of the 5d2/6d/5d3 on that one

Only people who have no idea how things work. Molst people who bother to read DXO have sufficient intelligence to get it, especially after reading DXO's explanation.

and you can describe for use their method and the validity of testing resolution of systems across platforms at different distances? Give us a break please.

DXO is an analysis site, not raw data provider. Until you can prove their analysis is wrong then please do give us a break.

well, I've found when I process my 60d images properly, the sharpness is really nice. And if you read TDP, you'll find out that my T4i RAW images are tuned to 1dx sharpness level right out of the camera -- in RAW.

I own 60D and 70-200 F4 IS and 17-55, both considered to be Canon's finest. for 17-55 at F2.8 it loses a lot of resolution.

sure, it is on a high pixel density sensor -- just a a 46 mpxl 5d4 would lose a lot

In terms of percentage, yes it would. in terms of absolute detail captured, 46MP FF will capture exactly 2.56 time more.

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