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Thanks again everyone.
Phil - I view your comments in high regard given your accomplishments in DSLR astrophotography. Thanks.
If I can get those stepdown rings for peanuts, it will be worth a go to see what happens.
Cam - luminance is everything. I rarely create an image these days without luminance data (lots of it) whether it be synthetic or real.
In this case, I DDP'd the rgb frames individually so that their histograms were similar. I then combined them using different permutations of pixel math to get the brightest result, with the most detail. The added benefit is that it has the same result of stacking lots of frames - you gain signal to process (less noise).
The key then of course is to process that lum to the best of your ability, because it will be that layer which will make the final image look great.
thanks
Martin
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