[AZ-Observing] Re: Comet 17/PHolmes - Swan Band filter
- From: Chris Schur <comets133@xxxxxxxxx>
- To: az-observing@xxxxxxxxxxxxx
- Date: Mon, 29 Oct 2007 08:41:12 -0700 (PDT)
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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