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Thanks Rolf, Mike, John, John and Ross for your kind comments.
I think the near infrared filter will do a good job on obscured objects that emit a continuous spectrum such as galaxies and globular clusters.
The same story can't be said for obscured emission nebulae.
I've tried the filter on the emission nebula RCW71 which is heavily obscured by the Coalsack. I'd estimate you would need to increase the exposure time by a factor of 10 or more to get a similar exposure to a clear luminance filter.
Clear skies
Steven
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