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

Tom, Good point.  If I set my CCD for the green
filter, which excludes the out of band light, then add
the swan filter on top, that may be sufficent.  An
hour exposure with such a combination may be quite
effective.  (hope its clear tonight!)

Chris
--- Tom Polakis <tpolakis@xxxxxxx> wrote:

> ---- 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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> 


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