Quote:
Originally Posted by Andy01
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So having just priced a new set of 2" AD filters at almost $A6k  I'm asking the community about the alternatives.
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Here you go Andy - $US 900 on Cloudy Nights for Baader f/2 50mm unmounted NB set .....
https://www.cloudynights.com/classif...m-filters-900/
50% Bandwidth ????
BAADER do not state the filter bandwidth (that I can find), but I suspect that it is not as narrow as the narrowest of conventional filters to try to cope with the higher angle of incidence in to the filter necessitated by faster optics
EDIT: Maybe FORGET that suggestion depending on what optic you end up using since, to quote BAADER...
"Our new f/2 Highspeed filters are entirely designed and exclusively manufactured to work for a focal ratio range of f/3.5 to f/1.8. They are NOT designed to work above that, say from at f/4 to f/10 and this may become very apparent to see in the imaging results, if someone would try this out – for these focal ratios, "classic" filters work better."
Best
JA