|
Interesting question Adrian.
In my area (20k Sth Canberra CBD) most if not all of the street lights are sodium lights. As I was troubled by light pollution I started off with an Astronomics CLS filter from Bintel. I was concerned that first night as I was staying in Paramatta and out of the hotel window the filter did not appear to cut out much light at all. mmmmmmmm Back home in Canberra, different story, it does help to some extent and depending on what I am looking at it can help. I have found the Baader Skyglow (Neodymium doped glass) filter to have a similar effect on reducing sodium light polution. UHC and OIII filters are much more agressive of course.
I have started using a 70mm F5 refractor as a travel scope. Last week I was at Tyabb airfield to the south of Melbourne. During the week I had a couple of opportunities for some brief observing sessions. I had taken a Baader Skyglow filter with me, the result ............. same as Sydney didn't help much at all.
If possible, I suggest you try before you buy.
Cheers,
|