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Hi Antonio,
you should provide more details, a photo of the setup and the hologram would be also helpful. Anyway, if you use silver halide plates, my first guess would be overexposure.

Petr

Hello good afternoon I'm Antonio from Barcelona. I put into practice the recommendations that you told me about table construction (some time ago), and it seems that it is beginning to bear fruit. Thank you all,
I've gotten nice transmission holograms with top reference and two side object beams, adjusting the polarization of the reference beam. The holograms are bright, but with fog, as if you were looking through a window on a foggy day, and I don't know how to remove it, I would appreciate if you could help me, a hug.