Quote:
Originally Posted by alpal
f5.8 is giving you a nice image scale to zoom in on galaxies.
Did you measure the FWHM for the pic in this thread?
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f/5.8 and a pixel size of 9microns yield a scale of 0.99 arcsecs/pixel.
I took 41 lum subs ranging from an average FWHM of 1.87-2.97 arcsecs. I then divided these into 3 groups to produce 3 luminance combines for high res / high+medium res / all subs (all done in Registar & CCDStack). In Photoshop I create masks and blend the three using the high res image for the bright regions, medium+high res for fainter regions, and all subs for the background.
I take the R/G/B subs when the seeing isn't good enough for luminance (but still not too poor
).