Return of Interesting article on DxO about 5D III and D800...

Started Apr 10, 2013 | Discussions thread
aftab
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Re: Same
In reply to schmegg, Apr 12, 2013

schmegg wrote:

I appreciate your posts - and I don't really disagree with most of what you say from a pragmatic standpoint.

However - I'm really not sure that it is helpful, conceptually, to attempt to espouse that resolution and sharpness are the same thing.

They are not.

Sharpness is the combination of resolution and acutance. Sharpness can vary independently of resolution. An image can be quite sharp but have low resolution (and high acutance). An image can also be soft but have high resolution (and low acutance). The best looking images have high resolution and high acutance - they appear sharp and detailed.

My personal opinion on this (as you've probably gathered as I've been pretty vocal on it - sorry) is that mixing these terms only leads to confusion down the track. You see comments like "a 5Dc out-resolves an 18MP crop" etc. These comments are made by people who are confused about these different imaging parameters - and probably because they simply have not conceptually separated and identified each for what it is (and what it is not).

I really think it's moreĀ usefulĀ to think of sharpness as what it is. And likewise resolution and acutance.

Yeah, as photographers we should keep thing simple,think of resolution as detail or discernible line pairs, line width etc over a specified area and think of sharpness as certain quality of those details. But we should also keep in mind that all these concepts are not as discrete as definitions would lead us to believe and have limitations when it comes down to final viewing of an image. That's why for many years scientists have been trying to come up with something more accurate and more practical (DXO's attempt is just one of them) for assessing optical or image quality. This is a good read

http://www.simulatedvision.co.uk/V&A_Chap10.pdf

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