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I've been stacking my astro shots for 5 years and just realized my flats were all wrong after a talk at the Tucson star party.
The speaker pointed out that my flats, taken at dawn, were capturing a changing sky gradient, which explained the weird uneven backgrounds in my final images.
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foster.patricia7mo ago
But I've always had good luck with dawn flats myself...
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ramirez.blair7mo ago
Seriously, is a dish soap brand worth this much debate?
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holly_garcia7mo ago
Wait, you're still using dawn flats after hearing that talk? The whole point was that the sky brightness changes way too fast at dawn to get a good, even flat. You might get lucky sometimes, but that's all it is, just luck. It explains why your results are so hit or miss. You need a stable light source, like a proper flat panel or even just a white t-shirt over the scope at dusk when the sky is more even. Why keep using a method that's basically a gamble?
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