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Thanks again Guys.
Greg, I should be able to do more checking tonight and will look at all your excellent points. I have a Starrett Machinists Level and got the mount base very level. I'll check the drift alignment as it seems I have been maybe too trusting with the TPoint Polar Alignment. I noticed a peculiar effect with the guide image box. The initial 'large' image from STi was noisy but the Dark frame fixed that. Image reduced down to 30 x 30 pixels with the selected star centred and guiding started. During the guiding session for the 10 min sub, even though CCDSoft indicated it reused the dark frame, only about 1 in ~10 images lost their hot pixels which then came back for the next (or so) guide image. Most peculiar and I can't describe it any better!
I always balance pretty well before a session since the mount only is 'permanently' mounted and I have to re-fit the OTA. I have no trailing cables, all power and USB cables go through the mount and then to the cameras, OA, 2x USB Hubs and the telescope from the Versa Plate. I have just looked at the mount and there may be a small problem in this area. The setup of the MX describes how to get extra cables through the mount, up to the Versa Plate. I did that with 2 USB cables and a 9 wire flat cable and just found they (or something) is acting slightly like a spring, winding up and releasing as the mount turns. I'll check this further.
Camera and OAG are firm to the scope. My eyes are no good anymore for viewing so my setup is solely for imaging. The camera is clamped to the AO which is screwed to a spacer screwed to the scope.
Stuart, I will email Rich and see what he suggests. I put an image into your Dropbox and will join the DSI group. I hadn't thought about there even being a DSI group!!
Charles
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