Ephotozine Review: Z 100-400/4.5-5.6 S VR

Started Jan 25, 2022 | Discussions thread
BasilG Forum Pro • Posts: 10,022
Re: A picture is worth a 1000 words
1

JimKasson wrote:

BasilG wrote:

Though I like the simple mathematical argument, I guess there's a practical question here - what does rL>>rS mean? Even a 24 MP FX sensor has approx. 160 pixels/mm, approx. 80 lp/mm if you want. If ">>" means "5x" or "10x", then you will struggle to find a lens that can resolve that much, and below that, it may be hard to argue that the other component can be entirely neglected.

A while ago, I came up with the following chart for lens vs. system resolution for various sensor pixel counts (using the formulae detailed here: https://photo.blogoverflow.com/2012/06/the-realities-of-resolution/ ):

Things would appear to break down when approaching and exceeding the 24 MP FX sensor's pixel pitch because I would expect aliasing to do something to these curves, but I am not sure how that would be incorporated here. Maybe Jim can weigh in?

Why don’t you just stop plotting each curve where the aliasing starts.

That would be the most pragmatic approach probably.

By the way, your assumption of 100% fill factor doesn’t hold for some cameras, like the GFX 50x ones.

Good point.

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