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making of flats; flats are used to remove shadows caused by vignetting and to remove stains in the image; two t-shirts do the trick
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Comment by Arie Nagel on April 20, 2011 at 12:56pm
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Hi Charles, thanks for the information. I know the principle and they are also available in Europe. But indeed expensive and i wonder if it really is worth the money if your 'only' aim is to produce nice pictures. One of my friends (Karel Teuwen) is one of the best photographers in the world and he used to make flats at the sky, just around sunset and sunrise.
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Comment by Charles Dunlop on April 20, 2011 at 12:11pm
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The big boys all use these. refocus, slew to flatman, turns on, flat, then back to target, plate solve to line up perfect, then shoot again. That's how Gendler, Keller, etc all do it.
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http://alnitakastro.com/products/flat-man-xl/ It's not cheap but they work great, you'll need plate solving software if you want to flat for each filter color, but this thing works great, no question.
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Charles, what is a flatman?
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no Marc, in fact i close the roof and make exposures up to half of the saturation; this takes usually a few seconds, so i don't need a dark; however i have to subtract a bias
the shirt on the wall is not really needed and has been removed by now
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Comment by Marc Basti on April 20, 2011 at 11:16am
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Arie, do you wait for the sun to hit the shirt on the wall? 1 t shirt on the scope or is it doubled up? I'm prying for your secrets haha. Thanks Arie Marc
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Why not use a flatman?
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