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DGM Optics NBP filter Mike - the same one you use, I have the 2" version fitted to the front of my Zeiss 135 or Pentax 50mm lenses via 48-49 step ring. I am testing it out for use with imaging during the bright moon, so far the results are promising - but I am having difficulty getting the colours to look right. I have a CGE as well and will try that out for comparison - I hoped that will give more natural colours but so far I has not.
The shot is a stack of 6x360s at iso 800, conditions were poor, high cloud blowing through during the run.
Still using it means I can image during a full moon...so I am happy. As I mentioned the focus for this shot was off a bit and with the lens wide open that has distorted the stars a bit, especially at the lhs of the image.
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