Quote:
Originally Posted by Merlin66
Logan,
The tight transmission curves at OIII and Ha shows it's much more than an UHC filter.
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Yes the peaks are much tighter in bandwidth on the dual narrowband filter compared with the UHC filter. Some time ago I had the idea of using a UHC filter in this way with a DSLR and using the BLUE channel for OIII, and RED channel for Ha. For a dark sky (no light pollution) one could even use the GREEN channel with either the dual narrowband or UHC filter. I had made a comparison of these together with a Nikon D800 sensor response. I will look for the comparison and post it here later.
Best
JA