Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

Started Jun 16, 2014 | Discussions thread
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bobn2
bobn2 Forum Pro • Posts: 44,026
Re: Crop Factor, Low Light and Aperture with m4/3 lenses? Part 2

noirdesir wrote:

bobn2 wrote:

Anders W wrote:

Just another Canon shooter wrote:

Anders W wrote:

Just another Canon shooter wrote:

Anders W wrote:

"What is known based on the laws of optics is that if we take a lens design for a certain format, say a 50/1.8 for FF, and scale it down in all relevant dimensions so as to make 25/1.8 for MFT, the two lenses will deliver the same resolution if we measure per image diagonal (and the MFT lens twice as much as the FF lens if we measure per mm) at the same f-stop as long as resolution is limited by lens aberrations only."

There is no such thing as limited by lens aberrations only.

In optical theory there is.

No, there is not.

Yes there is.

Anders, please cite this 'optical theory'. So far as I know, there is always diffraction. How is any lens not subject to diffraction?

In a theory where you ignore diffraction, diffraction has no effect.

I suppose that is true.

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Bob

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