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Thanks Merlin for your advice. You are the very Man that has started my line of thought. I have read some of your info on the StarGazers lounge. I contacted Craig Stark from Stark Labs about using PHD to do what I'm suggesting and his claim was that the De-Rotator will effect the Guiding of PHD after about 30sec. But I feel he may not be understanding that the Guiding will not be connected to the De-Rotation in any way. As you have mentinoned the Guiding will be done via a Guide scope so my thoughts are that it will go about doing that job. The image capture will happen at the rear of the scope after the De-Rotator and the De-Rotator will address the image rotation. The other idea was to fit an AutoGuider before the De-Rotator so that I could capture a guide star, and that way still be done seperate from the image capture on the back of the De-Rotator.
I am finding it hard to get past all the myth about De-Rotating and get the facts from people that have used them. It seems they were originally and expensive option and to start with did not work well. It has neow setup a vein of myth that in most cases is sread by people that have never seen one.
The first one I purchase a year ago did not work (From the USA). It has taken this long to get it replaced by Meade. I got a new replacement two days ago. They are still avaliable and after looking inside they have made some needed improvements. I am sure this will add to my options avaliable to capture DSO's. As soon as we get good weather the trials begin.
Regards
Martin
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