From: Alan Friedman <alan@greatarrow.com>

Date: February 8, 2006 2:59:22 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Luna_20060206_MJA.jpg

Hi Milton -

Could you say more about the noise reduction achieved with the cooling unit? I have always thought of temp related noise to be an issue with CCD chips used at relatively long exposures rather than the short exposures used for planetary imaging. 

BTW, when I used my DMK camera at 30 second exposures on the ring nebula this past summer I was surprised to see very little evidence of noise in the raw frames. 

thanks -

Alan

On Feb 8, 2006, at 4:36 PM, Milton Aupperle wrote:

I did however get to run the Flea camera with my external peltier

cooler unit, which dropped the camera from the ambient temp of about

-5°C to  -25°C. A layer of ice was coating the outside of the camera

by the time I stopped imaging. This reduced image noise a fair bit -

but I have no quantifiable numbers on how much.

TTYL..

Milton Aupperle