Calling all SCT owners. Despite my best efforts at keeping it relatively dew free and applying a bit of gentle hair dryer action after wet observing sessions, I appear to be developing some fine spotty "film" of crud on the corrector. This is also where the dew first begins to condense whenever I bring the scope out. I really have little experience of SCT's and don't know how much crud is normal, acceptable, and how often a clean is recommended. It's about the same I guess as that which collects on a typical exposed mirror surface after 6-12months of use, so I suppose it's just what happens
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I miss my pristine slightly purple tinted corrector - sniff... should I clean or follow my own advice re mirrors that unless it's very very bad, don't touch it?
cheers,