Hi
Re; filters in Bortle 6+ skies with OSC and DSLR
Maybe this filter STC-Duo will be useful
https://www.cyclopsoptics.com/astron...filter-48mm-2/
Some good reviews there. I like the one comparing the IDAS filter. Cost is about $500AU, hmmm
Here is another for $300. Also impressive.
https://www.cyclopsoptics.com/filter...pectra-filter/
Cheers
GlennB