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

Started Apr 4, 2013 | Discussions thread
schmegg Veteran Member • Posts: 5,768
Re: Don't get your meaning?

Mike CH 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.

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.

Why would I want to compare that way?

Depends on the type of photography you do I guess.

Wouldn't it make, in a practical sense (I know, I know - not really wanted around here), more sense to compare a situation where the same image is presented to the different sensors? That would mean that I would compare attempts to capture the same scene with two different sensor sizes. (Ie. different focal lengths on the different sensors to compensate for the different crop sizes).


The way I understand you, you want to compare at the same focal length for both sizes (ie. ignoring image differences due to different crop factors). To me, when taking a photograph, that comparison is of very little interest, because the framing is too different.

To you certainly. To someone who shoots BIF or macro the story could well be very different.

The reason you'd want to compare this way is because it's the only sensible way to determine which sensor resolves more detail from a given amount projected onto it.

I think the problem with DxO's figures is that they are sharpness measurements, not resolution measurements. And this causes a lot of confusion - particularly in these forums.

The upshot of that article is that, although the 5D3 resolves less, at the same time it delivers sharper images, and as such, the "perceived resolution" is quite similar.

In fact, even DxO mix-up the terms in that article, but you'll notice that they are talking about sharpness, not resolution. And this thread is mis-named along the same lines. It really should be titled ... "Interesting article on DxO about 5D III and D800 sharpness"  

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