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I've attached a couple of histograms from a series of flats (same iso and exposure) with and without the 2" CLS filter in my FSQ106ED, using the excellent lightbox I bought from Peter Miller.
You can see the CLS filter drops the intensity (lower histogram) to at least 50% of the unfiltered example, so doubling the exposure will only get you back to where you were, but hopefully with less light pollution or airglow.
cheers,
Andrew.
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