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May have missed the boat for M20 this year now, but I did consider that some of the difference could indeed be the magnitude of the subjects, but all of them are bright nebulae.
I should also add, if it wasn't obvious that I am using a one shot colour camera. I have long coveted a mono instead, but the results with the CLS make me wonder because a mono is great for narrowband but useless for RGB in the city and you can't have RGB through the CLS and narrowband not without masses of effort - a definite disincentive to bother!
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