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just an added query here. As i look into the quark, it looks like I may have to add an ERF to the front of my OTA as it is a sextuplet - so three elements in the focusser end. i cant put a IR cut filter in front of those elements. Even though the elements are air spaced, i'm worried that i will overheat the glass elements. As an ERF is way too much, i thought it would be cheaper to get a cheap 80mm doublet. What do you think?
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