Re: [APML] Back in the saddle...

["Dave Cole" <dave@nexstar11.com>]

Hi,

Its a site at about 3000 feet close to Eugene Oregon...  :)

Thanks,
Dave
For Nexstar GPS tips, tricks, and general information about the NexstarGPS
scopes visit http://www.nexstar11.com.
For free astronomy software visit www.nexstar11.com, select "Downloads".
The UNOFFICIAL site for NexstarGPS information.
All information is "In my opinion" and not to be taken as fact.
Non illegitimi carborundum est. - Don't let the bastards grind you down.


----- Original Message ----- 
From: "Scott Hammonds" <shammonds@creatorsview.com>
To: "'Discussion of Film Astrophotography'" <astro-photo@seds.org>
Sent: Wednesday, March 31, 2004 4:38 PM
Subject: RE: [APML] Back in the saddle...


Very nice Dave. Where is Eagles Rest Site #2?


Scott Hammonds
www.creatorsview.com


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org] On
Behalf Of Dave Cole
Sent: Wednesday, March 31, 2004 5:59 PM
To: Discussion of Film Astrophotography
Subject: [APML] Back in the saddle...

I finally got my first film shot in 10 years posted...
http://www.nexstar11.com/naneb1.shtml  Took it last season, and will be
doing more film work this season...

Thanks,
Dave
For Nexstar GPS tips, tricks, and general information about the NexstarGPS
scopes visit http://www.nexstar11.com.
For free astronomy software visit www.nexstar11.com, select "Downloads".
The UNOFFICIAL site for NexstarGPS information.
All information is "In my opinion" and not to be taken as fact.
Non illegitimi carborundum est. - Don't let the bastards grind you down.


----- Original Message -----
From: "Carlos Milovic F." <cmilovic@yahoo.es>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Wednesday, March 31, 2004 2:25 PM
Subject: Re: [APML] stacking & adding film images


> >      When you say "add" ... are you refering to
> > actually adding the images
> > together, as in a true stack, or are you averaging
> > all the images together,
> > as in a true average?
>
> Hi Tony
>
> Adding and averaging are stadistically the same thing
> in terms of SNR. Averaging just rescales the result
> and thus the differences in signal or noise values are
> only a constant.
>
>
> > Adding all the images together
> > might have a problem
> > with all the stars becoming completely saturated ...
>
> That is a problem with the "space" we are working.
> Imagine that we have real numbers instead of integers
> in the 0-255 or 0-2^16 range. Of course, when working
> with "real" images (normal images) we are limited to
> the bit deph, and thus averaging is the correct method
> to combine the images if the sum of the images gives a
> value grater than the upper limit.
>
> BTW, when you average a set of images in some bit
> deph, you get a rounding error, and thus working in
> the higher bit deph avalayble is always a good choise
> to preserve the data.If you have no choise (for
> example in a Photoshop earlier than CS), there are
> some ways to avoid a little this problem and is just
> to distribute the data in the whole dinamical range in
> a better way before stacking. I think that Chuck has a
> method that takes that into account (see Jerry's
> page).
>
>
>
> =====
> Regards,
>
> Carlos Milovic F.
> -------------------------
> Astro & Photo - CMF
> http://www.astrophoto.vze.com
> -------------------------
> Visita "AstroFoto", el foro de astrofotografía en español
> http://espanol.groups.yahoo.com/group/astrofoto
>
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