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		<subject index="0" >Re(3): CALIBRATION</subject>

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In fact John & Lindsey have nowfocussed the telescope.

Here attached is an image of the star used to focus on - it's at magnitude 8.2

The image size is about 30 arcmin across (size of the full moon)
and that's 1024 pixels square. 

The image of a focussed star - see attached - is around 2 pixels 'full width at 
half maximum' -  that corresponds to about 3 arc seconds (if I've worked it out right in my head) and that characterizes the astronomical 'seeing' - which is tonight
pretty good - that rain has cleared the air!

Andy

Andy Norton writes:
John and Lindsey are now focussing the telescope initially using Arcturus as a reference star ... before moving onto  something a bit fainter to fine up the focus ... this telescope is too big really to look at anything as bright as a star like Arcturus...

Andy