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The reason I was looking at the Daystar ERF is I can get it for less than $400 in a custom made cell to fit the scope Im going to use. The 90mm Baader is about $480 unmounted at current exchange rates. Although Im not sure how much I would need to spend for a cell if I had nothing suitable here. They both mention UV/IR blocking and keeping heat out of the tube. Not sure what the differences are I dont know enough about them.
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