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Hi Barry
Thanks for your input. I would like to ask you about another point, not directly on your enquiry Damian but perhaps of interest to you too.
I have tried piggy backing my ED80 on the Mak 150 and also built a sturdy platform for side by side mounting. However, in each case I get thdreaded flexure. When operating the Mak150 focal reduced to about 1000mm this flexure it at about 0.7 pixels per minute in the RA direction. This is not enough to spoil single images which I normally take up to a max of 6 minutes but it does cause an annoying slow drift of successive images across the screen during long imaging session say up to an hour. Any comments? Some say that this drift may be cause by movement in the Mak mirror but since it is so consistent I am inclined to think that it is caused
by the relative shift of my imaging and guiding scopes. Incidentally, my guiding is usually rock solid using PHD software with RA and DEC movement kept withing less than + or - pixel.
Cheers Peter
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