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Hi: I have a used system 89 i was getting dark spots on my prints i called the technician he performed a prnu said everything was ok and now i have more spots than ever! Can anybody tell me which is the proper way to do a prnu?Thanks.

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Before performing a PRNU the whole optical system( lamphouse , filters ,lcd surface and lenses) need to be perfectly clean. If not then, the prnu calculation will take into account imperfections(dust etc) that may fall off/move later. Giving spots that are no longer there! Sounds exactly what you have.

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