From: Mark Gaffney <markgaffney@me.com>
Date: October 12, 2009 12:42:48 AM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] PGR Scorpion long exposure
Hi Rodolphe,
I think it`s my cooler in Photos. It was made following the instructions below. I needed basically a cooling chip the size of the camera or thereabouts, a variable voltage transformer & a PC fan with heatsink. Help was given by Milton most steps along the way! Mark.
zipped .pdf document
On 12/10/2009, at 5:17 PM, Rodolphe Pineau wrote:
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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