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Old 01-02-2008, 09:52 PM
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allan gould
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Watec 120N+ integrating camera

Due to the cloud I haven't been able to test this Watec 120N+ camera under the stars as an imaging camera in its own right (I've been using it as my guiding camera). However I was wondering how it would go with various integrations starting at 1/50th sec up to 120 seconds integration. In the photo Ive arranged them as a snake from shortest integ to 120 sec integ. Also are two larger frames, one is a 60 sec dark at 25deg C and the other a 60 sec integ pointed at a visually dark surburban area.
It really seems to integrate well and I was extremely surprised at the 60 sec dark frame as I can only see a few hot pixels which look essentially the same as a 120 sec dark.
However I purchased a very cheap video USB grabber ($30) on ebay and when you look at a static picture I can see fluctuating lines crossing the screen at an angle from left to right. In bright light when doing an avi its not there, so I think its some sort of interference when I integrate and download the picture. Sometimes with some settings the frame is actually posterised You can see that in the background picture.
Anyone some suggestions other than pay $2-300 for a better frame grabber. Any reasonable recomendations welcome.
Regards, Allan
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  #2  
Old 02-02-2008, 09:37 AM
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[1ponders] (Paul)
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I don't know enough about it to really make an informed opinion Allan, but could it be some sort of intelacing artifact?
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Old 02-02-2008, 01:39 PM
Karls48 (Karl)
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Allan, I had similar problem when I was using security motion detection PC card for meteor detection. Vertical banding was worst with Mintron colour camera and not so bad with GStar. Firstly I replaced video coax (I was using 75 Ohm old network coax because I had heaps of it) with 50-Ohm coax. It got better but not by much. After much mucking with whole set-up I found out that if I change BIOS setting on my desktop computer, banding almost disappear. Setting is “Spread Spectrum”. I don’t have clue what it does and I don’t remember setting I used, but it did work.
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Old 02-02-2008, 09:37 PM
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Thanks for that, I'll give it a try.
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Old 03-02-2008, 08:24 AM
Zuts
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Quote:
Originally Posted by allan gould View Post
Thanks for that, I'll give it a try.
You probably already know but this is a very good bios guide

http://www.adriansrojakpot.com/Speed..._Guide_02d.htm

Paul
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Old 03-02-2008, 09:06 AM
Karls48 (Karl)
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Great link Paul, now I know why did it worked.
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Old 03-02-2008, 09:12 AM
Karls48 (Karl)
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I have noticed that I swaped cable impedance values. It should read TV Video coax 75Ohms and network coax 50Ohms
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Old 28-09-2009, 10:50 PM
gant88
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Watec 120N+

Hi,
I just purchased a Watec 120N+ for Transient Luminous Events observation. Could you recommend the best setting for the gain and the shutter speed of the camera?

Thank you

Guillermo Naranjo
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