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 Post subject: A "kitchen-sink drama" with auto-guider!
PostPosted: Sun Nov 18, 2012 4:05 pm 
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Joined: Mon Oct 12, 2009 6:47 pm
Posts: 1250
Location: Bolton
I finally had some clear sky last night to try out the off-axis guiding system on the back of my C8:
Attachment:
File comment: C8 fitted with Pentax DLSR, OAG unit and LX-webcam, on CG5-GT mount
guiding3.jpg
guiding3.jpg [ 121.65 KiB | Viewed 3559 times ]

As it was rather cold, I'd set up my control console inside the kitchen, with the cables routed out through the window:
Attachment:
File comment: The contol console was as near as I could get to the kitchen window!
guiding2.jpg
guiding2.jpg [ 199.51 KiB | Viewed 3559 times ]

My initial experiments were to determine how the field-of-view of the guide-camera relates to that of the main imaging system - this should help me in future to locate convenient guide-stars close to my intended targets.
In the example below, I could offset the comet from the centre of my field, so as to get a 7th-magnitude star onto the guide-camera's CCD:
Attachment:
File comment: Cartes du Ciel display showing the field-of-view of the DSLR and the annular window for the guide-camera
cometframing.jpg
cometframing.jpg [ 49.14 KiB | Viewed 3559 times ]


But by the time I'd got all this worked out, it had clouded over. :(
Hoping that the clouds would clear again, I went off to do something else for ten minutes - only to rush back with towels to rescue the outdoor equipment when I realised that it had started raining! :roll:


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 Post subject: Re: A "kitchen-sink drama" with auto-guider!
PostPosted: Sat Feb 09, 2013 12:49 am 
Very nice setup, what ccd have you been using? CCD's are soooo expensive.


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 Post subject: Re: A "kitchen-sink drama" with auto-guider!
PostPosted: Sat Feb 09, 2013 7:48 am 
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Joined: Mon Oct 12, 2009 6:47 pm
Posts: 1250
Location: Bolton
mhall wrote:
what ccd have you been using?

An old Philips webcam (available for under a tenner a couple of years back) which I converted for long exposure (but only need a couple of seconds for this application).


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