Quote:
Originally Posted by BJunge
Hi,
I have a WO GT71 and use a QHY8L Colour camera for astrophotography. To get to dark skies I have to travel for over an hour, and with a two young children it is hard and I only get one chance a month to do it.
I live on the Gold Coast with a lot of light pollution. I need to purchase a filter that suits my setup so I can take photos from my back yard.
I have been doing some reading and it seems there are quite a few out there and just as many differing opinions.
Currently I am leaning towards an IDAS filter, but am more than happy to hear opinions from others who have an informed opinion and/or real experience with such gear.
Many thanks,
Brendan.
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There really isn't a filter that you can use to photograph broad spectrum objects like galaxies or star clusters in a bright sky. However, you can take fantastic nebula photographs with very narrow filters, like:
H-α
O-III
S-II
N-II
and then combine them in stacking or image processing software. I have an acquaintance who takes 2 hour shots here in LA and gets fantstic images, even though a broad spectrum image is pure white in 10 seconds.
You want to keep the bandwidths of those filters to 7nm or narrower to avoid LP ruining the images.
Broadband filters these days are more of an enhancement filter for use in very dark skies. Unfortunately, with the advent of LED lighting, light pollution is very broad spectrum.