PIX 2015

Diffraction Limit Discussion Continuation

Started Feb 21, 2014 | Discussions thread
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Just another Canon shooter
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Re: Cutting to the chase.
In reply to Jonny Boyd, Feb 25, 2014

Jonny Boyd wrote:

)Just another Canon shooter wrote:

Jonny Boyd wrote:

Just another Canon shooter wrote:

You will not notice much difference if you open up more, either. All this based on you idea that a 5% drop from, say, 1200 is the same, visually, as 5% drop from 2400, which is a very bold assumption and flat out wrong at moderate viewing sizes.

And where exactly is that assumption?

You are applying 5% threshold for low density sensors and for higher one. This does no prove existence of a limit but let us play that game for a moment. Why fixed percentage? Why not measure it absolute terms? Why not on a log scale?

In this post (Re: Diffraction Limit Discussion Continuation) I said:

If we said that a resolution difference of 0.1% was the limit of perception, then for all practical purposes, peak resolution is indeed a plateau that stretches over several apertures for smaller sensor sizes.


Again, it was just giving an example of where the change in perceived resolution could be. It wasn't intended to be a hard and fast claim that our eyes will only notice a drop in resolution of 5%. Not were any claims I was making dependent on that figure.

That was not my point. Why do you think that X% drop in resolution, whatever that X is, should be the right way to measure sensitivity? Why not X divided or multiplied by the actual MTF-50 number? Or something else?

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