Diffraction Limit Discussion Continuation

Started Feb 21, 2014 | Discussions thread
Anders W Forum Pro • Posts: 21,468
Re: Diffraction Limit Discussion Continuation

Jonny Boyd wrote:

Anders W wrote:

Jonny Boyd wrote:

there,s nothing there that I hadn't already said to you in other ways.

There most certainly is: The recognition that the point along the aperture range where peak image resolution occurs is independent of sensor resolution.

I never denied that.

Yes you did. Do you want me to look up the specific posts where you denied it or are you going to acknowledge it voluntarily?

I said that at low resolutions it's more of a plateau that a peak, so you effectively get the same resolution at smaller apertures.

No you didn't say that. You said the peak would occur at different apertures depending on sensor resolution (just as Cambridge in Colour). Do you want me to look up the specific posts for you?

Substantively, I have only two comments: That peak sharpness will occur at exactly rather than approximately the same aperture and that "my/our" side is hardly the one to blame for any conceptual or terminological misunderstandings.

Anders, I avoided assigning blame to anyone and put it down to misunderstanding.

Yes I saw that. So I pointed out what was missing.

Don't be in ass in response.

I am not being an ass. You decidedly are by calling me one for absolutely no good reason.

You felt it necessary to assign blame and point fingers when I had hoped the conversation could have a fresh start.

Look! A number of us took time to teach you (I don't apologize for the expression) what things are actually like. We were rewarded by all sorts of insults. Now we are somehow made up as the guilty party just because you not man enough to stand up and say you made a mistake.

If you substantively agree then you'll also agree that when the sensor resolution drops below a certain level, the aperture size won't perceptibly reduce the system resolution in the same way as a system with a sensor resolution similar to the lens resolution. And once you get to a high enough sensor resolution, diffraction overwhelmingly determines system resolution so that the whole system is effectively diffraction limited from wide-open.

What I substantively agree with is the following:

When the sensor resolution is much lower than lens resolution, variations in lens resolution will have but a small impact on image resolution (but still always such that increased lens resolution leads to increased image resolution). When it is the other way around (lens resolution much lower than sensor resolution), variations in lens resolution will have a much stronger impact on image resolution.

I tried to put that to you earlier, but you seemed dismissive of the idea. I'm unclear about whether that is still the case..

Where was I dismissive about the idea as I spelled it out above? Please provide specific references (the post/posts you have in mind and the passage/passages in those posts).

I'm not interested in dissecting the previous discussion.

For pretty obvious reasons.

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