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Some of you may find this a useful reference.. do they work?
To some degree, yes; some very well, some meh...
I also have a 29 page document on filter use, wavelength filtering, etc.. which provides a comprehensive reference document on a variety of filters (not just coloured planetary filters)...
It's a little large to post here but, if you would like a copy, please pm me your email address & I will send it to you..
Cheers
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