Interesting article on DxO about 5D III and D800 resolving power

Started Apr 4, 2013 | Discussions thread
schmegg
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Re: Interesting article on DxO about 5D III and D800 resolving power
In reply to Hans Kruse, Apr 5, 2013

Hans Kruse wrote:

schmegg wrote:

Hans Kruse wrote:

The diffence is quite remarkable and with a full frame 645 sensor the sensor area is around 2.6 times larger so it is to be expected that the resolution is much higher.

The size of a sensor is not the governing attribute that determines its resolving power.

If you photograph the same scene (=same FOV) which is how everybody does this kind of comparisons, then yes, it is!

Just like APS-C sensors resolve less detail than a full frame sensor with the same number of pixels.

Given the exact same detail presented to the sensor plane (which is the only really valid way to determine which sensor can resolve more), an 18MP Canon crop will resolve more detail than a 22MP Canon FF sensor.

Not if you photograph the same scene which is what DxO does and everybody else.

I think you are considering situations where the detail presented to the sensor plane is different to begin with - something that isdue to the difference in sensor size in many situations.

Every review site I know of compares resolution via shooting the same scene (same FOV). You have a different way, but this is unusual and therefore creates more confusion

Hehe.

It should be noted though that most of these 'review sites' testing does not test the resolution of cameras, but the sharpness of lenses. It's an important difference.

The 'resolution' figures are mathematically derived from the apparent sharpness of the image - not from actual resolved detail. The test targets they usually use really don't contain much detail anyway - here is the DxO target as an example.

When you look at that target it's easy to tell that drawing conclusions about how much detail a camera can resolve from it will be an exercise in mathematics and can only really be based on acutance.

Having said all that, it's not a surprise to me that DxO have found what they have. They are simply saying, in effect and perhaps without knowing it, that sharpness is perceived as resolution (even though it's not), and that, even though the 5D3 resolves less, it also provides higher acutance, so the net result is closer than you might, at first, think.

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