bottletopburly Posted August 16, 2020 Share Posted August 16, 2020 I’ve been plagued with getting good flats with primarily my 8” Newtonian I just don’t think using the El panel they work correctly on the vignetting , I just came across a blog http://astronomy.colinrmitchell.com/index.php/2020/06/15/taking-flats-with-a-large-newtonian/ where this chap seems to have found the answer by using a projection screen and a light box to illuminate screen , now a few years back I used to point my scope at the living room window for flats and I can’t seem to remember having issues, the window is probably 20ft away So next time I use the Newtonian I’m going to re try this method and see if this works better than the El panel and maybe create a custom park so it centres on the window. 1 Link to comment Share on other sites More sharing options...
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