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Seriously, if your sensor is so filthy, CLEAN IT! I really think flats are a lazy excuse sometimes for a clean sensor.
I keep my sensor as spotless as possible. Examining any of my fits you won't find any dust motes to speak of. I find I am better off manually removing any residual defects by zooming in and using a clone tool.
Some clean, some don't. Take your pick. Why not the best of both worlds - a clean sensor cover with any minor defects flat corrected?
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