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Old 28-08-2018, 06:40 PM
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Slawomir (Suavi)
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Slawomir is offline
 
Join Date: Sep 2014
Location: North Queensland
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You are right Brent, Luminance usually blocks anything below 400nmm and above 700nm. I believe Lum filter is meant to be used with refracting telescopes to help controlling chromatic aberration of light that is invisible to human eye but nonetheless picked up by the camera - without such filers stars would have been larger/more bloated with fast refracting telescopes that are commonly used for imaging.
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