Rob, thanks for the Bahtinov suggestion. I've got an 8" one for my SCT so will consider one for the 5" too, although I have to say that I was a little disappointed with my first attempt at using one. I found that I had to have a bright star, and I found that the critical focus point was not as sensitive to focus adjustment as I imagined that it might be...
Deborah - I hope that you enjoy the journey!
Graeme - thanks!
Jennifer - I must admit that I was surprised how much light was gathered too. I first tried a 2 minute exposure and it was washed out.
JJJ - Thanks for the suggestion - a right-angle camera finder would make it easier, but I really would like to be able to get the pics onto a PC screen. Unfortunately there does not seem to be a Canon 20D driver to Windows 7, so I can't even control the camera from the PC. Works in progress..,..
Chris
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