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Old 09-08-2015, 09:57 AM
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codemonkey (Lee)
Lee "Wormsy" Borsboom

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Join Date: Jul 2013
Location: Kilcoy, QLD
Posts: 2,058
What's your typical FWHM?

I'm curious to know, especially for those that live within reasonable distance of me, what is the typical FWHM (in arcseconds please) of stars in your images?

Using broadband filters I can't seem to get below about 2.6" with 2.8" - 3" being the norm.

So now I'm wondering; is this basically the limit of seeing here, am I able to improve things by using existing equipment better, or is there some limit in my equipment that prevents anything better?

Last night the seeing seemed pretty good. I was imaging at 1"/px with a guiding RMS error of around 0.5". I was using PEC and imaging close to pole and RA was about the best I've seen it. DEC was strangely not as good as it has been, but still, 0.5" of error is definitely at the better end of what I've been able to achieve.

I've ordered a IR-pass filter to try putting over the QHY5L-II to try and reduce the amount of seeing-induced movement on guidestars so it'll be interesting to see how much impact that has.
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