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It is a thermal phenomenon resulting from electrons spontaneously generated within the silicon chip (valence electrons are thermally excited into the conduction band).
![dark noise bands dark noise bands](https://www.irishweddingbands.ie/wp-content/uploads/2019/10/The-Big-Noise-Shot1-scaled.jpg)
Black frame needs to be taken right after the picture for 2 reasons: you need the same exposure and camera settings to get proper amount of correction and usually some pixels are always hotter but not always, for example part of the sensor could be warmer and pixels in that area will be hotter than usual. In camera, long exposure noise reduction works on the principle of black frame : you take a picture of total darkness, any pixels that are bright are considered hot and will be corrected on the original picture. You should take more pictures to see if it's consistent or just one of a kind weird interaction (for example, very unlikely in this case but maybe it was jet contrail?). The forum I suggest has a DSLR specific area with many good tips and resources for learning this stuff I dabbled in it for a while before moving to the city and not being able to see any stars at all now :/ It is very important that you shoot both frames one after the other to ensure that temperature etc is pretty much identical for both, as that will affect the amount and pattern of amp-glow.įor more information on astrophotography, check out Cloudy Nights forum, I can't recall the direct address but Google is everybody's best friend. This results in a shot that 'should' be completely black, but won't. After you take your shot, put the lens cap on and shoot again using the exact same settings. The procedure for shooting these is quite simple. The solution to this is to take a 'dark frame' and 'subtract' the dark frame from the light frame you have. Not to worry though, you can compensate.Īs for the banding, that is caused by the sensor's amplification of current, and noise generated by electrical activity during the shot.
![dark noise bands dark noise bands](https://prodmerchnextimagestore.blob.core.windows.net/imageproductxl/be428479002443ca8c62b1b62739dab4.jpeg)
Looks like your in quite a light-polluted area for astro-photography.