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Old 23-07-2008, 08:25 PM
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sheeny (Al)
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sheeny is offline
 
Join Date: Jun 2005
Location: Oberon NSW
Posts: 14,305
Get a Parfocal EP

Just another little tip that may help.

Have a play during daylight, and get a focussed image in the webcam. Then try different eyepieces and see which one is the closest to being in focus without adjusting the focusser. If you can find one that is close enough or that comes into focus without winding the focusser out too much, you can use it as a parfocal eyepiece. i.e. parfocal means the EP and the webcam will be in focus at the same position.

Having a parfocal EP will greatly assist you to make the most of your webcam - especially if you aren't tracking the moon. You can use the EP to get the focus right (or at least close if it isn't truly parfocal). You can buy a parfocal ring to clamp around your EP or webcam nosepiece so it slides into the focusser just enough to match the focus of the webcam/EP.

I'm pretty lucky... my 10mm guiding EP is parfocal with my ToUcam.

Al.
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