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Hi Al, my aim with using the filter in front of the objective was to reduce internal heating and stess to pst components. I guess Coronado engineers think the design is ok, but it seems ideal not to have the full force of the sun coming through the objective. Just recently I singed my hand with a magnifying glass while showing the kids the power of the sun (meaning to burn through paper, not my hand). I figure if I can keep some heat out of the scope without degrading the image, why not do it.
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