Bottletopburly Posted February 13, 2021 Share Posted February 13, 2021 For a while I have had a flats problem, thinking at first it was caused by the led panel not working right , using different panels etc along the way , well this week I picked up on a post on Startools forum https://forum.startools.org/viewtopic.php?f=10&t=2103of a chap in the USA using a Nikon D5300 same as mine turns out Nikon use some sort of compression on the raw  file that causes issues for Astrophotography users , luckily a uk user sharkmelley has written some code to fix this issue prior to stacking and from what I have read seems to solve the issue so I’m hoping fingers crossed , so I need to convert raw to dng format then run the program that sharkmelly has written on the dng files Light /flats and darks , bias  leaving me with fixed images to stack , pi users can run a script that sharkmelly wrote too but as not everyone uses pi he wrote a windows exe too , what a great community we have in astronomy (Note , some newer Nikon’s have a menu where this compression can be turned off ) list of cameras affected copied from post on CN The application should now work with the following lossy compressed file types: D5100/D5200/D5300 14-bit and 12-bit D500              14-bit and 12-bit D600/D610         14-bit and 12-bit D7000/D7100/D7500 14-bit and 12-bit D3S/D3X           14-bit and 12-bit D4                14-bit and 12-bit D800/D800E/D850/Df 14-bit and 12-bit D5500/D5600       14-bit D7200             14-bit D750/D810         14-bit D3100/D3200/D3300 12-bit D5000             12-bit 1 V1/1 J1     12-bit CN post link here https://www.cloudynights.com/topic/746131-nikon-coloured-concentric-rings/page-8 so hopefully I will squire some fresh data to try on on the meantime I will see if I can dig some old data out a have a play . +RonC 1 Link to comment Share on other sites More sharing options...
+Graham Posted February 13, 2021 Share Posted February 13, 2021 Life is never easy and straight forward is it. Hopefully you have now sorted your issues. Bottletopburly 1 Link to comment Share on other sites More sharing options...
Bottletopburly Posted February 13, 2021 Author Share Posted February 13, 2021 13 minutes ago, Graham said: Life is never easy and straight forward is it. Hopefully you have now sorted your issues. hopefully graham Link to comment Share on other sites More sharing options...
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