JSeaman Posted March 16, 2021 Share Posted March 16, 2021 I don't know why I didn't do this before - I have never bothered with flats often and when I have it has been with a T shirt over the scope during the day and I usually end up moving it and generally doing a rubbish job. Today I took delivery of a 40x40cm 36W LED panel (eBay 124209366763) and attached it to the observatory. I managed to make the scope pirouette to it with the roof in place and stored that as an unpark position in EQMod and tested it tonight - perfect. I shoudl have done this long ago! £11 and 10 minutes is all it took 5 Link to comment Share on other sites More sharing options...
michael8554 Posted March 17, 2021 Share Posted March 17, 2021 36 Watts ! How did you attenuate that enough to get good Flats ? Michael Link to comment Share on other sites More sharing options...
JSeaman Posted March 18, 2021 Author Share Posted March 18, 2021 ? It's not brighter than pointing at the sky, just adjust the duration for a mean value of ~30k and away it goes. Worked perfectly Link to comment Share on other sites More sharing options...
michael8554 Posted March 18, 2021 Share Posted March 18, 2021 What exposure was that ? Michael Link to comment Share on other sites More sharing options...
JSeaman Posted March 18, 2021 Author Share Posted March 18, 2021 0.06 on the panel, 0.01 last time I used the sky Link to comment Share on other sites More sharing options...
michael8554 Posted March 19, 2021 Share Posted March 19, 2021 So no mechanical shutter on the camera ? Michael Link to comment Share on other sites More sharing options...
JSeaman Posted March 19, 2021 Author Share Posted March 19, 2021 I don't understand what you're getting at? Link to comment Share on other sites More sharing options...
michael8554 Posted March 19, 2021 Share Posted March 19, 2021 I was concerned about your extremely fast exposures. Cameras with mechanical rolling shutters such as the ASI 1600MM will often have a shutter artefact in the Flat with exposures faster than about 1 second. Michael Link to comment Share on other sites More sharing options...
bottletopburly Posted March 19, 2021 Share Posted March 19, 2021 11 minutes ago, michael8554 said: So no mechanical shutter on the camera ? Michael Looks like a zwo camera in photo so global shutter 1 Link to comment Share on other sites More sharing options...
JSeaman Posted March 19, 2021 Author Share Posted March 19, 2021 No there are no artefacts Link to comment Share on other sites More sharing options...
wimvb Posted March 19, 2021 Share Posted March 19, 2021 2 hours ago, bottletopburly said: Looks like a zwo camera in photo so global shutter Actually, no. Many zwo cameras have rolling shutters. Just not mechanical. Still, there can be problems with short exposure times. But there’s only one way to find out: examine the images. Link to comment Share on other sites More sharing options...
michael8554 Posted March 19, 2021 Share Posted March 19, 2021 6 hours ago, JSeaman said: No there are no artefacts Good to hear Michael Link to comment Share on other sites More sharing options...
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