From: Alan Friedman <alan@greatarrow.com>
Date: June 21, 2006 11:07:57 AM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Jupiter through my 6" refractor
Hi Milton -
I checked - the pixel noise percentage is 3.7 for red and 2.8 for green and blue.
I have not tried using white light luminance for Jupiter in a long time. I do shoot Saturn this way and I have tried binning for the RGB data - also using a shorter focal length and resizing the images for the composite - both work fine. With Jupiter so low in the sky there will be significant atmospheric dispersion that will blur an image captured over the full visible spectrum (I don't have a dispersion corrector - I guess this would be an option). I carry IR, R, G and B filters in my four position filterwheel - I need another hole to mount a clear filter. Thanks for the suggestions.
best -
Alan
On Jun 20, 2006, at 1:52 PM, Milton Aupperle wrote:
Hi Alan;
Nice sharp images. Did you happen to take notice of what the "Pixel
Noise Percentage" was after staking?
One thing you might want to try out when doing your next LRGB imaging
session on the 10" scope is shooting your Luma image normal, and then
shoot some or all of your color filtered images in 2x2 binned modes.
This is done all the time in DSO imaging.
Since your using the RGB channels to basically colourize the Luma
channel, you likely won't lose much color detail at all. And the
binned modes will give you about 4x as much light, which means you
can run faster frame rates or use less gain. And using less gain will
be a good thing no matter what you do.
Just a thought..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
#1005 - 815 14th Avenue. S.W.
Calgary Alberta Canada T2R0N5
1-(403)-229-9456
milton@outcastsoft.com
www.outcastsoft.com
On 19-Jun-06, at 8:46 PM, Alan Friedman wrote:
> Here is an image taken through my 6" A-P refractor using a Baader
> FFC to yield a
> focal length of about 3.5 meters.
>
> http://groups.yahoo.com/group/Astro_IIDC/files/Planetary/
> jupiter061206.jpg
>
> I probably could have used a little more power. Seeing was quite
> good - Jupiter
> was just under 34 degrees in elevation.
>
> These images were stacked and aligned in Astro IIDC using manual
> alignment. I
> used multiple alignment points and averaged the results - it made
> little or no
> difference at this focal length, the alignment done on the center
> of the disk worked
> very well. Processing was done in Adobe Photoshop CS2.
>
> Phil - the way to avoid the crispy planet edge is to use PS or
> similar program which
> allows you to select just the areas you want to process. This is
> the most powerful
> feature of this program.
>
> best wishes -
> Alan
>
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