Quote:
Originally Posted by gregbradley
Thanks for that. Yes I knew that and its why I decided for my Honders not to switch to 3nm at my dark site on the advice of Don Goldman. But my home site, whilst fairly dark, does have some easterly pollution and I wonder how much of a gain you get from the 3nm. They are very expensive.
3nm narrowband filters seem to be used on this site often with the QSI683 as 30mm filters are far less expensive than the 50mm square ones.
Greg.
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I've just started using Astrodon 3nm Ha filters, not sure how other passband ones compare as I've never used them but I have a sky limit of ~12-13 minutes with a full moon in the light polluted burbs of Melbourne.