Re: [APML] NGC 6914 Tech Pan Tri-color and CCD comparison

["Mike Cook, AF9Y" <mwcook@concentric.net>]

Volker,

     Thanks for the info.  Looks like your filter has the same upper rolloff
as the SBIG blue filter.  I've been looking at a Schuler UV filter which
goes from 340 to 390nm.  It would be interesting to try some Quad-Color
images with an injection of violet color controlled by the lum of the
UV filter.


From:           	"Volker Wendel" <volker@spiegelteam.de>
To:             	<astro-photo@seds.org>
Subject:        	Re: [APML] NGC 6914  Tech Pan Tri-color and CCD comparison
Date sent:      	Wed, 31 Oct 2001 18:48:28 +0100
Send reply to:  	astro-photo@seds.org

> Take a look here:
> http://www.spiegelteam.de/Ausstattungsbilder/RGB-Blaufilter.jpg
> 
> This is a special made dichroitic filter. The numbers below the curve are
> 380,430,480,530.
> 
> Volker
> www.spiegelteam.de
> 
> 
> 
> > Thanks!  What type of blue filter are you using?
> >
> >
> > From:           "Volker Wendel" <volker@spiegelteam.de>
> > To:             <astro-photo@seds.org>
> > Subject:        Re: [APML] NGC 6914  Tech Pan Tri-color and CCD comparison
> > Date sent:      Wed, 31 Oct 2001 07:52:49 +0100
> > Send reply to:  astro-photo@seds.org
> >
> > > Hi Mike,
> > >
> > > I have two channels from a tricolor shot made with my astrocamera. Itīs
> blue
> > > and red. I will scan it the next days and sent it to the list.
> > >
> > > Volker
> > > www.spiegelteam.de
> > >
> > > ----- Original Message -----
> > > From: "Mike Cook, AF9Y" <mwcook@concentric.net>
> > > To: <astro-photo@seds.org>
> > > Sent: Wednesday, October 31, 2001 5:56 AM
> > > Subject: [APML] NGC 6914 Tech Pan Tri-color and CCD comparison
> > >
> > >
> > > > Chuck Vaughn and I have been comparing NGC6914 CCD and
> > > > Tech Pan images.  Here is a webpage showing both images:
> > > >
> > > > http://www.webcom.com/af9y/ngc6914ccd.htm
> > > >
> > > > (thanks to BenDaniel for the java tip)
> > > >
> > > > One thing that you will notice is that the Tech Pan image has
> > > > extra blue in the lower half of the image.  Chuck believes this
> > > > is due to the extra UV portion of the spectrum include in the
> > > > Tech Pan image but not in the CCD.  I have my doubts that
> > > > there would be such an abrupt drop off going from top to
> > > > bottom.
> > > >
> > > > Anyway, we're wondering if anyone out there has another
> > > > ngc6914 color image for comparison.  It would be especially
> > > > good if anyone else is using a wider blue filter.
> > > >
> > > > Thanks,
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > Mike Cook, AF9Y
> > > > http://www.webcom.com/af9y
> > > > mwcook@cris.com
> > > >
> > > >
> > > >
> > > >
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> >
> >
> >
> > Mike Cook, AF9Y
> > http://www.webcom.com/af9y
> > mwcook@cris.com
> >
> >
> >
> >
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Mike Cook, AF9Y
http://www.webcom.com/af9y
mwcook@cris.com




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