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Old 10-11-2018, 08:52 PM

JA is offline
Join Date: Oct 2016
Location: Melbourne, Australia
Posts: 1,480
Originally Posted by Merlin66 View Post
The tight transmission curves at OIII and Ha shows it's much more than an UHC filter.
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.

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