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Why Does My Dark Frame Look Like This?

Started by Chris1, 03/10/2008 11:32PM
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Posted 03/10/2008 11:32PM Opening Post
Chris Nisbet
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Join Date: Jul 2001

Location: Cedar MN, US

Posts: 103

Title says it all. This dark frame was taken with a ST-8XME, 5 minutes @ -35C. Why the gradient? No matter what I do, the 5 minute dark frame looks like this. All was well a couple nights ago-dark frames were normal. Any thoughts?

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Posted 03/11/2008 12:59AM | Edited 03/11/2008 01:04AM #1
Floyd Blue
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Join Date: Mar 2003

Location: Bakersfield CA, US

Posts: 4913

Not sure why the banding is there? Light leak maybe?
This is what a 5 minute dark at 8°c for my DSI III looks like.

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[SIZE="Large"][/SIZE][COLOR="Blue"][/COLOR] Floyd Blue grin
Amateur Imager
Posted 03/11/2008 02:28AM #2
John Biretta
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Posts: 1188

I'd also guess light leak.

Theres some situations where a big over-exposure
will leave charge in non-imaging layers of the
CCD, and it will make darks like this, but it
should go away in a couple hours. Or will go
away if you warm-up and cool down again.
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Posted 03/11/2008 03:23AM | Edited 03/11/2008 03:23AM #3
ROBERT MOORE
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Location: WARWICK NY, US

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Here's my 5min dark @-15c with SX MX-716

Bob

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R.A.C. Advisory Committee
NEAIC Co-Chairman
NEAF Advisory Committee

http://www.deer-pond-observatory.com
Warwick, New York
41.15984 -74.2541

[B]Takahashi MT 160
10" F4.5 Newt 8O
R200SS grin
Some kind of 127mm APO

Orion Atlas EQ-G
Losmandy G11 with Gemini
iOptron Mimi Tower
iOptrom Cube Pro

Meade DSI PRO II 8O
SBIG ST-10ME
Image Source 21AU04.AS

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