Re: How does projection magnification in astrophotos change the Airy disk size?

Chris L Peterson wrote:

You are talking about blur size as the apparent (to the eye) diameter
of
imaged stars?

Nope. We are talking about imaging.

A star that appears huge on an image,
and one that appears as a tiny point, both have the same FWHM.

Not true. FWHM varies with the wavelength, in all three main
determinants:
diffraction, seeing and detector's spectral sensitivity, as I already
mentioned.
Besides, it is rather obvious that actual resolution is determined by
the size of image blur - or smallest resovable detail on an extended
object - not some "representative" FWHM value. The latter is only an
indirect indicator of
the general resolution level, that can be compared to the basic FWHM
value
determined by diffraction alone, Lambda/D.

Vlad

.

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