[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter

---- Chris Schur <comets133@xxxxxxxxx> wrote: 
> Aj, I have a 48mm swan band filter, Ill try to get
> images of the comet with the CCD and well see whats
> out there!


Chris,

I think Lumicon describes the Swan Band fileter as "visual-only", meaning that 
there is nearly 100% transmission beyond 650 nm or so, where dark-adapted eyes 
are not sensitive.  Unfortunately, cameras are very sensitive in red 
wavelengths, making some Lumicon interference filters ineffective for imaging.

Tom






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