Ags Posted March 18, 2012 Share Posted March 18, 2012 I thought I would shoot flats for my 55mm lens using my laptop screen - but the results are rather stripy... what went wrong and how do I avoid this in the future?I've stretched the image to make the problem more visible. Link to comment Share on other sites More sharing options...
steppenwolf Posted March 18, 2012 Share Posted March 18, 2012 This could be a sync issue. I suspect that the screen has a refresh rate that is interfering with the image exposure length - think wagon wheels on old cowboy movies ... Link to comment Share on other sites More sharing options...
Psychobilly Posted March 18, 2012 Share Posted March 18, 2012 The shutter speed is a bit to fast so you either need to dim the screen - try adjusting the brightness but this can make matters worse or use sheets of paper as diffusers...Peter... Link to comment Share on other sites More sharing options...
Ags Posted March 18, 2012 Author Share Posted March 18, 2012 Thanks all. I am starting to think I'll never shoot a correct flat! Link to comment Share on other sites More sharing options...
Ags Posted March 18, 2012 Author Share Posted March 18, 2012 I tried my monitor on min, mid and max brightness and the stripes disappear at max brightness, although that might just be luck as the exposure at that setting was 1/2000.Maybe I need one of those flat panels. However, I have never had stripes when using the iPad as flat field (although I was taking flats for a 400mm lens at the time). Using the iPad would involve the risky undertaking of wresting the iPad from its addict/owner. Link to comment Share on other sites More sharing options...
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