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It's a great method. I do the same thing but without the t-shirt (which would prevent me from scratching the screen but I have nothing appropriate to use at this stage).
Additionally I make sure to rotate the scope as well as move it around the screen (translate) to average out imperfection in the monitor. This does require a fairly big screen, but they're pretty cheap these days.
Because the screen is so bright, exposures are normally around 1/100th of a second, so I can easily collect 50 flats with this method very quickly.
Thanks for sharing,
Cam
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