152mm A+M Refractor(OfficinaStellare-1200mmF/L) using an APM Flattener and a Baader 7nm Ha 2in. filter , with a CanonEOSII 6D'stock-new 2017 model' for four 661secISO6400 CR2.s from 2018 . {{ Why I re-did these CR2.s is because I was looking through the MaximDL Pro V5 Handbook Manual I have and then I looked at "Settings" and 'Files' . So in the 'open' window of "Settings" and the 'Files' tab there is an option that I don't have 'checked' which is 'Save Data in Unsigned Format' which means if a CCD camera or the Canon DSLR's have 'signed' numbers the data will be saved with the 'signed' numbers and there will be negative numbers and MaximDL Pro cannot read 'negative' numbers which means they probably aren't showing as their part of the 'light' frame image in the 'buffer' when you put one in to work on it . Therefore when 'opening' 'signed' number images you must use the radio button for 'Add offset to make positive' which creates a pedestal to force the 'negative' numbers to become 'positive' and showing for their part in the image . When you 'open' MaximDL Pro , you must 'open' the "Settings" and activate the radio button for 'Add offset to make positive' and press 'Apply' to make it active because when you close the program it resorts back the the radio button for 'Treat data as unsigned' which doesn't try to fix the 'negative' numbers problem and could result in data loss in the image and might be causing line artifacts , ? . So, with an 'open' image in the 'buffer' and using the 'Calibration' command to an image ... some of the 'calibration' Masters might not be 'calibrating' because some of the data might be 'negative' numbers and causing things to an image . I tried a SUPERBiasMaster of 256 frames to an image and there were 'verticle' line streaks which could be seen after applying "Digital Development" and then brightening the image which then showed the 'verticle' lines ... and I always have the 'Save Data in Unsigned Format' 'unchecked' for everything I do . To eliminate this problem I will 'check' the box for 'Save Data in Unsigned Format' for Autosave images and 'bias' and 'darks and 'flats' if needed and then use the radio button for 'Treat data as unsigned' when processing 'light' frames and then there shouldn't be any problem . With existing SuperBiasMasters for all the CanonEOSII RebelT7i , I 'opened' each SuperBiasMaster while the "Settings" 'Files' tab had the radio button for 'Add offset to make positive' active and then I did a "Save As..." with an added description of OFFSET and then I put those SuperBiasMasters into the "Set Calibration" command and I 'calibrated' a few images and they didn't show 'verticle' streaking , which means Masters might be able to be 'saved' from the 'negative' dilema that's probably existing as a mis-calibration affect . Seems like the best option is to switch to using the 'Save Data in Unsigned Format' for any kind of calibration frames and 'light' frames and be done with it . }} .x
