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Originally Posted by Logieberra
Really! Is there a tech explanation why that might be?
My Astronomik LRGBs don't and my sold Astronomik 12nm didn't... how strange!
Big Mike, pls rattle that Ha 6nm  |
I don't think it matters for narrowband filters, but a rattling Lum filter could potentially cause some extra unwanted effects due to filter-glass being at a non-right angle (that would vary throughout the night with different telescope orientations) to incident rays and thus acting as a rectangular prism.