From: albe albo <richter1956@yahoo.com>
Date: September 27, 2010 1:21:18 AM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Jupiter Image
Thank you Alan,
Perhaps the name BigOne caused a misunderstanding..
I meant BigOne = Jupiter Planet and not big "image of Jupiter".
They are not so big i guess.
Anyway you are right: I capture pretty high focal then, if necessary, i scale down.
In this case i scaled down at 50%. LOL
Unfortunately this method results in a lot of additional work.
Perhaps it is only a matter of satisfaction to see the Jupiter disk almost filling the DMK31 chip even if the signal/noise ratio become veeery critical.
It is like the dream of a lottery player hoping in a very very perfect night that would allow me not to scale down the image.
Cheers
Alberto
PS: this is pretty big and very good since it has been done with a DFK colour camera:
http://www.astronomycamerasblog.com/2010/09/22/beautiful-photo-of-jupiter-and-io/
I will calculate the aperture since the author doesn't write the OTA but he say that it was shot at f 32.
Unfortunately he doesn't say if he used a dbk 21 or (31-41) in order to get the pixel size in microns
Da: Alan Friedman <alan@greatarrow.com>
A: Astro_IIDC@yahoogroups.com
Inviato: Dom 26 settembre 2010, 15:33:57
Oggetto: Re: [Astro_IIDC] Jupiter Image
Hi Alberto,
That's a very good color correction on Milton's image... and your images and expecially the movie came out very well indeed. I think you are capturing at f40 and then reducing the final result? You might try the opposite - capture at a shorter focal length and process the image at 2x. This is how many are producing Jupiter images at such a large image scale... when the seeing is decent it can be an effective technique I think.
best wishes,
Alan
On Sep 26, 2010, at 7:01 AM, albe albo wrote:
Hello Milton,
nice for a color camera.
I am not able to get good result with my DFK, i don't know why.
The details are always so messed up while with the DMK and the filters it seems to go better.
Perhaps it is due to the possibility to process 3 or 4 different channels so the averaged result is better.
30° above the horizon?
Wow...i didn't remember you live so much at north.
Only a question : why did you leave the image so uncorrected regarding the white balance?
In my opinion it is pretty cyanotic.
I played with an automatic white balance (no other corrections) and perhaps the result is overcorrected but more similar to the visible Jupiter.
http://dl.dropbox.com/u/1094920/ASTRO/Jupiter/Jupiter_20100922_MJA-AWB.jpg
Now we'll have a good Jupiter period while i don't know if Saturn will be really good again (for me) in this life... unless we go to live at Mark Gaffney home.
TTYL
Da: milton_aupperle <milton@outcastsoft.com>
Inviato: Dom 26 settembre 2010, 03:58:33
Oggetto: [Astro_IIDC] Jupiter Image
Hi Folks;
My first jupiter since 2005, as this is the first time it's finally got higher than 30° above the horizon:
http://tech.groups.yahoo.com/group/Astro_IIDC/files/Planetary/Jupiter_20100922_MJA.jpg
Details at the bottom of the image.
It's also the first time I have imaged with the 1280x960 Chameleon USB 2 camera on a scope, all my testing before has been indoors and bench testing. The EXHAD CCD is quite sensitive and I was imaging with 16 ms exposures and no gain at 2 meter focal lengths.
I tried shooting at 5 meter focal lengths, but it just falls apart into a blurry mass. I also had condensation on the corrector plate too (humidity was 85% @ 4°C), so that dimmed and blurred things a bit too.
TTYL..
Milton Aupperle
