Many thanks for providing your experience with the Quark. I have taken the plunge and am trying to get to grips with it. So far I have had limited success getting it “in tune” but will keep persevering. The extra back focus required on my WO Zenithstar 80 means I am having to use a right-angle eyepiece holder which I’m not sure is helping even though Daystar show it can be used that way. I plan to get a longer extension tube so that I can have it straight through.