Quote:
Originally Posted by alpal
Hi Peter,
that's very sharp.
I am always impressed with your Astro-Physics RHA 305mm F3.8 Honders Astrograph.
What is the FWHM?
cheers
Allan
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Looks to be about 1.8" (CCD inspector images attached)
0.1 arc-sec tilt in the y-axis apparently....then again, no, probably just a calibration error.