gpowers Posted February 24, 2021 Share Posted February 24, 2021 HI, I need to plug at least one hole in my knowledge ... and a whole lot more eventually I have a general question on DARKS. If i have a DARK library taken with a particular setup, and due to Framing an Object I rotate the camera, ? - does that invalidate my DARK library and hence have to create another. I guess the same would go for FLATS also ... any wisdom appreciated gary Quote Link to comment Share on other sites More sharing options...
AstronomyUkraine Posted February 24, 2021 Share Posted February 24, 2021 23 minutes ago, gpowers said: HI, I need to plug at least one hole in my knowledge ... and a whole lot more eventually I have a general question on DARKS. If i have a DARK library taken with a particular setup, and due to Framing an Object I rotate the camera, ? - does that invalidate my DARK library and hence have to create another. I guess the same would go for FLATS also ... any wisdom appreciated gary Rotating the camera has no effect on the dark library. Dark frames capture random electronic thermal noise, so no need to take new ones after the camera is rotated, but they should be refreshed every 6 months or so. Flat frames ideally should be taken after every session, along with the accompanying dark flats, but unless you rotate the camera, they should be OK to use on several imaging sessions. Your calibrated lights will usually let you know if you need to take fresh flats. 1 Quote Link to comment Share on other sites More sharing options...
TerryMcK Posted February 24, 2021 Share Posted February 24, 2021 Absolutely what Brian says is spot on. I personally don’t take dark flats. Just regular flats and add darks that might be six months old. However I don’t take flats every session if I know that the optical train has not changed since I last used it. Quote Link to comment Share on other sites More sharing options...
Gina Posted March 7, 2021 Share Posted March 7, 2021 Same here Terry. Quote Link to comment Share on other sites More sharing options...
Carastro Posted March 7, 2021 Share Posted March 7, 2021 Agree with above replies, also Darks should be at same temperature as the lights. I reuse mine every time as I have set point cooling. Carole Quote Link to comment Share on other sites More sharing options...
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