Instead of the halo ridden Optolong L-extreme there are Antlia variants. Or use the optolong L-quad which is a great light pollution filter, better than the L-Pro. Only issue with the L-Ultimate is the narrow bandwidth which may or may not affect guiding with the Duo setup.
I image from my backyard in Glen Iris Bortle 6 with the L-Ultimate and the L-Quad and have great success. my scopes are in my bio
Hope that helps
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