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the PSF applies to the whole image, not just the stars, since the whole image is blurred by the atmosphere and the optics. An easy way to measure a system PSF is to pass light from a point source through the system and what comes out the other end is the PSF - in astro imaging, isolated stars provide the point sources you need. Using the stars is just a convenient way to get the PSF, but once you have it, it applies to the whole image. Deconvolution is widely applied in microscopy, where there are no natural point sources. PSF can be determined using tiny fluorescent beads to create artificial equivalents of the stars used in astronomy, but once PSF is determined using such a source, it is applied to the normal microscope images. Regards Ray
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So if we have an irregular shaped knot in a galaxy arm say (particularly if it is saturated) what does the application of the PSF derived from a star do to this shape?
Mike