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I battled with t-shirts and skyflats, and met with increasing frustration. Then I bought one of Peter Miller's light boxes. It's brilliant!!!
It has a dimmer switch that allows me to tune it to give me 0.1 sec flats, which can then be corrected with a simple bias-frame subtraction without the need for flat darks. I take 100 on each filter - it's so fast! (and effective)
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