RE: [APML] Tech Pan shot and Sh2-170

[spampit <spampit@shaw.ca>]

Great shots Richard,
	Your narrow band images show quite a variety of gases up there! Last
year's images look pretty darn decent, are you just adding more density by
shooting them again? The "blob" in the bottom RH corner of my shot is one
that is rarely shot on its own - Sh2-170. Probably not interesting with
e-line but not bad in h-alpha.

http://www.astrofoto.ca/john/files/sh2-170s.jpg
FSQ-106N, St-8XE, 10nm Schuler h-alpha

John Mirtle
Calgary, Ab. Canada

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org] On
Behalf Of Richard Crisp
Sent: Wednesday, August 10, 2005 11:48 PM
To: Discussion of Film Astrophotography
Subject: Re: [APML] Tech Pan shot

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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> 


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