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

Started Apr 4, 2013 | Discussions thread
Mike CH Veteran Member • Posts: 9,226
Re: Don't get your meaning?

John Sheehy wrote:

Mike CH wrote:

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.

This is the problem with monolithic concepts; there is more than 1 type of resolution, and there is much more to any kind of resolution than a single resolution, based on a single contrast threshold.  Then there is real resolution, and aliased "resolution".

A 36MP sensor can not possibly get the real (properly sampled) resolution of more than about 4 million transient objects (luminance objects; red or blue object resolution is 1/4 of that with a Bayer CFA).  Aliasing or spatial distortion will be minor maybe up to about 12MP, but beyond that, things get a bit flaky, and flaky is what we are accustomed to looking at, because we don't get to see better, except in comparisons that most people write off as "extreme", because we don't have fine displays (but finer ones seem to be around the corner - Panasonic is coming out with an 8MP 20" tablet; that would be 32MP at 40", and 72MP at 60").

Schmegg is talking about absolute sensor surface resolution, or resolution per unit of sensor area.  Others think of resolution as resolution per sensor.  It needs to be stated or at least established in context what type of resolution one is thinking of.

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?

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.

Regards, Mike

 Mike CH's gear list:Mike CH's gear list
Canon G7 X II Canon EOS 5D Mark III Canon EOS 5D Mark IV Canon EF 16-35mm F2.8L II USM Canon EF 100mm f/2.8L Macro IS USM +14 more
Post (hide subjects) Posted by
MOD Mako2011
MOD Mako2011
MOD Mako2011
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow