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  #1  
Old 09-11-2018, 03:42 PM
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Merlin66 (Ken)
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Bi wavelength filter!

https://www.cyclopsoptics.com/astron...d-filter-48mm/

Appears to give good filtering and suppression of background lighting.
Would need an OSC camera to separate and process the OIII and Ha images.
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  #2  
Old 10-11-2018, 02:12 PM
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Lognic04 (Logan)
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You'll find it's just a rebranded UHC filter:
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  #3  
Old 10-11-2018, 02:22 PM
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Merlin66 (Ken)
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Logan,
The tight transmission curves at OIII and Ha shows it's much more than an UHC filter.
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  #4  
Old 10-11-2018, 08:52 PM
JA
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Quote:
Originally Posted by Merlin66 View Post
Logan,
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.

Best
JA
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