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Rob, Yes we do have the Petzval. I use PhD guiding using this scope mounted on a skywatcher ED80. We have this set up on a Heq5 pro mount and when all is well it goess well. We have just found out that our order of guide rings and dovetail bars will arrive this Friday which will allow us ( school) to move our celestron C8 from the wedge mount to the HEQ5 with the Ed 80 as a guide scope. Hopefully not too heavy. I'll have to get back to where I bought the 66 from as the barlow does make star selection for guyiding more difficult. Mark.
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