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

Started Apr 4, 2013 | Discussions thread
Mike CH Veteran Member • Posts: 9,631
Re: Don't get your meaning?

John Sheehy wrote:

Mike CH wrote:

I get that, no problem. It is real obvious that there are various definitions of resolution and various ways to measure said resolution.

What I don't get is, of what practical interest are those (various) measurements at all, if they don't compare at the same FOV?

FOV is irrelevant when you have the longest lens you can manage to use, but it is not long enough.  When you are focal length limited, all that matters is qualities of a recording surface (film or sensor) per unit of sensor area, or in lines per mm to look at it in one dimension, for resolution, at various contrasts (but resolutions are usually only stated at a single contrast).

Ah, I am not focal length limited. 80% of my images are below 100mm.

FF sensors fall flat on their face, especially Canon ones at low ISOs, when their hard crops have to compete the smallest compact sensors placed behind the lens.

Yes, FF are not optimal for birding, APS-C might be better for that. That is not really news

Since you are so fond of absolute measures, you do know, right, that the absolute, logical argument behind your rationale is actually provably wrong?

So far, people have been saying, these measurements exist. Yes, thank you - I knew that

Nobody has so far (that I have seen) eyplained of what practical use they are to a photographer. They are of interest to an engineer, yes, but the practical use I have not seen explained, yet.

We are creatures of illusion.  What seems to be the case to our eyes, is often wrong, because we fail to adjust for context.  If we find measurements that we can trust, then we can have "seeing eye dogs" to walk us through our illusions as we make decisions.

How can I trust measurements which I cannot compare in a practical situation?

If your whole argument is based on the premise that comparing at same FOV is not always possible because of being focal length limited, then I can at last see where you are coming from.

I don't think it matters much, though, in practical terms. This thread started out from a comparison between two systems which are quite similar in the available focal lengths. Thus in most cases comparisons at same FOV are quite possible.

Regards, Mike

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