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Bert,
1. Using very narrow band filters <4nm will allow the recording of emission wavelengths without allowing to much extraneous starlight getting through.
2. The equivalent of the Astrondon Red Continuum, may be available centred on other wavelengths - blue? green?
Using these would allow more control over the corrections applied to the stellar light by suppressing at blue/ green wavelengths as well as the red end....
Just my 2c
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