From: Rodolphe Pineau <pineau@rti-zone.org>

Date: October 12, 2009 12:17:28 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: PGR Scorpion long exposure

Hello everybody.

With Milton's help I have been able to enable the long exposure mode for my PGR Scorpion in Astro IIDC.

Now I have question for people who have use or are using this camera.

I did a few long exposure test on my desk with the camera cap on.

Short exposure where all dark (besides a few hot pixels). But anything above a few second and it's all noise. I I go up to 30 seconds it's becoming fairly bright noise. A 2mn test is almost full white. a 5mn test is all white.

The captor has a very high sensitivity as far as I can tell and the heat from the camera doesn't help.

So it looks like that if I want to use the Scorpion for any type of DSO I need some good cooling. I've seen the Peltier cooler on the Flea 2 in the photo section. What are other people using for cooling ? What type of result can I expect with a Scorpion ? What is the max exposure time (as opposed to the theoretical one of 60mn) ?

Thank you all.

Rodolphe

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