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Old 09-02-2013, 04:50 PM
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Joshua Bunn (Joshua)
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Joshua Bunn is offline
 
Join Date: Oct 2011
Location: Albany, Western Australia
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Well, I dont know how easy/difficult your RC8 is to collimate, but with my scope, CCDI reports between 0 and 1 arcsec error in collimation and tilt in x and y should be able to be eliminated i.e, .1 to 0".

FWHM will depend on factors in your control such as your equipment and factors out of your control e.g, atmospherics. So if you havnt overexposed the image, havnt got bloated stars, have good focus, good collimation, no ccd tilt and not viewing over thermals (pavement, concrete, houses), then your doing mostly what you can to reduce your FWHM. I realy dont know what you should expect at your location, but 1.5 - 2.5" is a pretty good result. Others may chime in here .

Josh
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