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

Started Mar 8, 2013 | Questions thread
Mako2011
Mako2011 MOD
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SFR
In reply to ultimitsu, Mar 11, 2013

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.

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.

Actually, only to a point. If you dig deeper, you find they have simply tried, poorly, to copy other systems with terms they can't really quantify. That's what's leading to there inconsistent results of late...AFAICT

Better to use Imatest SFRplus as it more accurately and consistently does what DXO tries to do with MPix, in a much better way.

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.

How did DXO test MPix? We don't know 1) how they tested?

Converted from MTF

How do you know? They never published any conversion data.

2) what 1 number means?

Explained very well by their article and was linked by us many times.

Explained very very poorly actually with no quantifiable data. Just undefined subjectives.

I think they made a mistake with the crop, and sent it to farther distant places -- an error in testing

That is exactly how it should be done.

Error's in testing are acceptable? (D7K as example)

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