Re: [APML] Tech Pan shot

["Richard Crisp" <rdcrisp@earthlink.net>]

Hey John

you also have CED214 in that image

coincidentally I am shooting that very pair tonight!

here's what I did in that area last year with an FSQ and the IMG6303

http://www.narrowbandimaging.com/cederblad_214_fsq6303_s2hao3_page.htm

and in Halpha only:
http://www.narrowbandimaging.com/cederblad_214_fsq6303_page.htm




----- Original Message ----- 
From: "spampit" <spampit@shaw.ca>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Wednesday, August 10, 2005 10:29 PM
Subject: RE: [APML] Tech Pan shot


> George,
> If the technology fails you for guiding, there is always manual
> guiding! It builds character. :-) I didn't notice that you were using the
> Lumicon filter. That being the case, you can most certainly go longer! 
> Under
> a moderately dark sky at f3.5 and the Lumicon filter, you can shoot for at
> least an hour with a first/last 1/4 moon up. I have always stayed 30 
> degrees
> away from the moon, it may well be possible to shoot closer than that. I
> never really did find the limits to this type of photography with
> telephotos. Under a dark sky and a Wratten 92 I know that I can shoot for 
> 45
> to 60 minutes at f1.5 and still have a printable negative. (with 5 minute
> development) http://www.astrofoto.ca/john/n7822.htm Maximum exposure time
> will vary, depending on your type of light pollution, how well the film is
> hypered, humidity levels etc. Maybe start with 45 minute shots at f3.5 and
> see what happens. You are going to need a very good polar alignment for
> these long, wide field, high-rez images! I never did try shooting under 
> full
> moon, you might as well try. Push the envelope!
>
> John Mirtle
> Calgary, Ab. Canada
>
> -----Original Message-----
> From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org] 
> On
> Behalf Of George Anderson
> Sent: Monday, August 08, 2005 8:59 PM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] Tech Pan shot
>
> Hi John, nice to hear from you again.
> I haven't done any vignetting reduction on the photo yet, too busy
> debugging other problems with my setup. I am in the process of switching
> from my 70mm f/10 guidescope with a 10mm EP containing a homemade
> non-illuminated crosshair, to my B&W quickcam on a 500mm f/8 mirror
> lens. The sensitivity is ok, just a real pain to align with the mount.
> The field of view is so small that I can't even swing polaris in a
> circle.
> That shot was done with a Lumicon HA filter under moderate light
> pollution, at 18 minutes the negative is thin to say the least. I did
> two more shots saturday night with the quickcam and laptop for visual
> guiding. Much easier on the eyes, but I hadn't aligned the camera and it
> was out by a good 5-10 degrees from the mount axis. Very nice trailing
> (three star diameters) on the two 30 minute shots...  :^(
> Just how much of a moon and at what angular separation from the target
> is safe with the HA filter? That will improve my shooting nights by 200%
> if I can shoot up to the quarter moon. Our weather always improves
> around that time.
>
> George
> Clear skies and good health
>
>
>
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> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
> 


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