Ags Posted December 30, 2023 Share Posted December 30, 2023 @vlaiv i was doing a simple "maximum" stack. I wonder if my random noise got corrupted by debayering, which I thought I had disabled? I realised today I have a whole heap of ash in the ash vacuum machine we use to clean the pellet heaters. As combustion is much more complete in a pellet furnace, I am hoping that that ash will be a good, purer addition to Radiological Test Source A. Also the pellets come from scandinavian pine, which is the best location. I will shoot an hour each of darks, control and ash shots tonight. I'll also not be an idiot and make sure the camera is set to mono! Link to comment Share on other sites More sharing options...
Leo S Posted December 30, 2023 Share Posted December 30, 2023 My cameras (3x a7SII) pick them up from time to time. Here are a couple of them (from different dates) which I've combined into a single image. These are very heavily enlarged/zoomed in. Link to comment Share on other sites More sharing options...
vlaiv Posted December 30, 2023 Share Posted December 30, 2023 2 hours ago, Ags said: @vlaiv i was doing a simple "maximum" stack. I wonder if my random noise got corrupted by debayering, which I thought I had disabled? Maximum will produce similar effect as it will pick up maximum pixel values when electrons spill into potential well. Link to comment Share on other sites More sharing options...
Ags Posted December 30, 2023 Share Posted December 30, 2023 I think I found the reason and it is human error. I had forgotten Planetary Stabilization was enabled, meaning the images were randomy dithered. Link to comment Share on other sites More sharing options...
Ags Posted December 30, 2023 Share Posted December 30, 2023 I repeated the experiment with more ash and an hour of exposure. The camera and sharcap settings were right this time too. I counted 8 streaks and 4 possibles with the ash, and 5 streaks and 5 possibles without the ash... There is an element of judgement of course, and I am hardly experienced at streak counting... Anyway here are the two images - what I consider definite streaks are marked with a green dot, and the more uncertain ones are given a red dot. Control: With Ash: Link to comment Share on other sites More sharing options...
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