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Hi Dave, thanks for the advice. It was the tuning !!!! Just spent the the last 3 hours watching 2 different proms. It was absolutely breathtaking. Cheers David

Thanks for the update. At least I know in what configuration it works, just need to figure out what I am doing wrong. Mostly likely the tuning.

Thanks. WIll keep playing around especially with the tuning. It was first time out the other day and used it with a canon 70-300mm f/5.6 DO lens. Reasonable results, with some post processing managed to get some surface detail. Also worked quite well with my 50mm guide scope. Was hoping to use the refractor to get more surface detail and magnification. Cheers David

Hi, did you ever try the Quark. I have the SkyWatcher Esprit 100 but cannot seem to achieve focus with the Quark. I have tried up to 200mm's of extensions both before and after the Quark. Thanks