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The Idas LPS filter does OK for light pollution, but you will lose a heap of sensitivity on galaxies and the like.
Here an image from the QHY-8 with my CDK-20, its a stack of 20 x 5 minute subs, with NO darks, No Flats etc, so you can get the feeling of what the image is like thru the IDAS LPS filter. I have also attached an image without the LPS, and notice the light gain.
Theo
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