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That is going deep with the cometcatcher! I dug up an image I made back in 2005 of various filters including the one I sent you Scott. Looks like it is somewhere between an LPR and NEB filter depending on brand.
The spectra below are from the top
Kenko R64
Nebula Filter NBN-PV from Hutech
LPR from Roger at BATSC (now Bintel) now with Scott
LPS-P2 from Hutech
Mercury street lamp
High pressure Sodium street lamp
Tungsten light globe
I wanted a visual way to see exactly what these filters did and how they related to those
light polluting lamps.As you can see High Pressure Sodium is the difficult one.
Again nice deep image of a faint target.
Bert
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