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Started by RUSTY845, 12/11/2006 11:05PM
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Posted 12/11/2006 11:05PM Opening Post
ROBERT MOORE
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Location: WARWICK NY, US

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I shot this the other night, 80ED,DSI ProII,20 30sec.exp stacked what do you think the black marks are.

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

Posted 12/12/2006 12:55AM #1
Thomas V Davis
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What were your processing steps? Darks-Flat reduction? Anything else?

Tom
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Posted 12/12/2006 01:03AM #2
Tom Tolla
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Bob, My guess is a few dust bunnies on the sensor . If it's there on a single frame.....it would be in the stack also. Shoot an over exposed frame and take a look. Same as a DSLR camera dust spot.

Just my 2 cents smile
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Tom T.
Guilford, CT smile
Posted 12/13/2006 04:30AM #3
Jim Thommes
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I have seen similar artifacts on some of my images. Turned out it was a lint string on the CCD window.

To see an artifact like this with your 80ED of about f/7, it needs to be relatively close to the focal plane - that's why I think it is on the CCD.

This kind of string lint usually comes from a Q-tip used to clean the CCD window. It's not so bad with the DSI since I don't think there is a cold chamber you have to disassemble to remove it. Take a close look with a magnifying glass.
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Jim Thommes

Mak-Newt 152 mm
C8
Megrez II APO
Zenithstar 66 mm APO
G11/Gemini
ST8300M
Artemis285 Camera
Canon 350D DSLR

http://jthommes.com/Astro/
Posted 12/13/2006 11:40PM | Edited 12/13/2006 11:41PM #4
ROBERT MOORE
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Well you all were right ( I think ) I looked today with a microscope and their were two samll pc. of lint. I have no way of checking untill the rain stops but I think its gone.
Can some tell me how the hell you keep a dsi clean? I have it in a case covered when not in use.


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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