ASI120MC and colored Pixel with long exposure

4ossa

Hello,

I hope i can explain myself in english ;) I m a newby and I 'm learning.

I try yesterday a sort of Deepsky single shoot with the ASI120MC with different Set Up. I used SharpCap as a Software. Just to see what is possible and to try to understeand how usefull picture can be made to work later on it.

I notice that depending on Set up, i get lot or less colored Pixel. Here a Picture with different Setup such a low and High Gain, brightness, etc.. Exposure was between 5 and 15 Second, depending on the pictures.

My question: what are those colored Pixel? Are Hot Pixel? Is just a setup issue in Software?

Do anyone get those pixel or may the Webcam has a problem and not funktion right?

As you can see from the picture, if I used low gain and high brightness, those colored pixel become less.

http://www.quattrossa.com/teleskop/2013/1ds.jpg

Do any of this pictures has a good setup for long exp?

thanks a lot

Antonio

stuw

The coloured pixels are normal noise and will disappear once you stack multiple exposures with bias/dark/flat frames.

4ossa

Thank you a lot StuW for your help!

many greetings

Antonio