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

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

actually I am just using a different setup to shoot a wider field of view

i am trading off resolution for FOV

i hope to have something to show in a couple of days.


----- Original Message ----- 
From: "spampit" <spampit@shaw.ca>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Wednesday, August 10, 2005 11:10 PM
Subject: RE: [APML] Tech Pan shot and Sh2-170


> 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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