Re: [APML] IC1396 CCD with Schmidt-like FOV

["Robert Gendler" <robgendler@worldnet.att.net>]

Chris,
Thanks. As I mentioned in my response to Loke I doubt its
chromatic aberration. I focused carefully for each filter. If you
check out Lokes image or any film image for that matter it is
common to see halos around bright stars. In the CCD world DDP
seems to accentuate this. BTW the lens is far from an APO. The focus
was significantly different through each filter. When using my FSQ106
I never need to focus separately for each filter. 
Rob Gendler
Email: robgendler@att.net
Web site: http://www.robgendlerastropics.com/
----- Original Message ----- 
From: "Chris & Jennifer Cook" <ccjd@ix.netcom.com>
To: <astro-photo@seds.org>
Sent: Saturday, August 03, 2002 6:26 PM
Subject: Re: [APML] IC1396 CCD with Schmidt-like FOV


> Hi Rob -
> 
> Beautiful images as always!
> I got a question though.  What is causing the bluish halos around the
> brighter stars?
> 
> Chris
> 
> 
> ==================
> Chris Cook
> Astronomical Photography
> www.abmedia.com/astro
> 
> 
> -----Original Message-----
> From: Robert Gendler <robgendler@worldnet.att.net>
> To: astro-photo@seds.org <astro-photo@seds.org>
> Date: Saturday, August 03, 2002 10:24 AM
> Subject: [APML] IC1396 CCD with Schmidt-like FOV
> 
> 
> >Hi all,
> >Using Nikon 180mm and 300mm lenses and the ST10
> >I've created a widefield color image of the IC1396 complex.
> >The inner detail of the nebula was imaged with the 300mm lens
> >(using HA and red as luminance) and the outer portion was taken
> >with the 180mm giving the generous FOV (straight RGB). I believe
> >the FOV and detail compare favorably with schmidt camera and
> >medium format film images of this object which demonstrates
> >that large field color imaging can be done successfully with CCD
> >and camera lenses. The widefield image is at
> >http://www.robgendlerastropics.com/1396Large.html
> >A cropped higher res version is at
> >http://www.robgendlerastropics.com/1396Small.html
> >The lenses were mounted on the ST10 using Steve Mandels adaptor
> >and were secured on the mount using two losmandy adjustable tube rings.
> >The 150mm ring fit perfectly around the ST10 while the 125mm ring
> >supported the lenses. I have two pictures of the setup at
> >http://www.robgendlerastropics.com/camera300.jpg
> >http://www.robgendlerastropics.com/camera180.jpg
> >Enjoy!
> >Rob Gendler
> >Email: robgendler@att.net
> >Web site: http://www.robgendlerastropics.com/
> >
> >
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> 
> 
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