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I use a long baffeled "dew cover" (2.5 feet on the 6in sn and 3.5 feet on the refractor) I have not made one yet for the 12 inch.
but they really work in my view to give better views... I am in a dark spot but bathed in starlight I dont want any down my ota...
Hubble has such an arrangement (baffles past the secondary position) and I feel its use give more contrast because light down the ota is greatly reduced...make sure everything is black on the inside of the ota...sometimes a screw is overlooked that need paint for example...
alex
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