From: Alan Friedman <alan@greatarrow.com>

Date: April 22, 2008 10:07:57 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Most Sensitive Camera that Astro IIDC supports

The blue channel will be the most challenged for both exposure and detail - due to the lower sensitivity of the chipset to blue light and also to the high turbulence factor of blue light in the atmosphere. Fortuantely, with both Saturn and Jupiter, a usable luminance image can be created with the brighter and more stable red and green data. The blue can be saved just for the RGB component. Since no detail is provided from the RGB, you could expose the blue filtered streams for as long as you want without harming the resolution of the final image. 

Your C11 should provide plenty of light for saturn. I usually work with an EFL of 7.5 meters using a 10" aperture. In average seeing, a larger image will not show any additional detail.

best,

Alan

On Apr 22, 2008, at 10:44 AM, doodlebun wrote:

I've been using the DMK21AF04 monochrome camera with my Celestron C11
and have been happy with the results using the LRGB technique with
Astronomik filters. (see http://gallery.mac.com/davidbleser#100065/Set-
201-20LRGB-204-19-20Final&bgcolor=black).

It has become obvious that if I tried to increase the focal length any
longer than I get using the Televue 2.5X Barlow I would get a larger
image. But the desired enlarge Saturn image in taken through the blue
filter would be nearly invisible when taken at 7.5 FPS.

If I switched to a FLEA2 camera or some other camera (640 x 480)
supported by Astro IIDC would I be able to achieve more sensitivity,
hence a bigger or brighter blue channel movie?

Perhaps Milton will tell me what camera he would get if money was no
object for planetary imaging supported by his software.