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"RE: colourful dots on picture during long exposure D800, please help?"
I haven't seen that sort of noise (i.e. bright spots as opposed to general noise in shadow/underexposed areas) with my 800E - but then I haven't done any exposures longer than 30 seconds.Although the spots in your pics appear completely random (indicating they're not stuck pixels) it might be an idea to repeat the exposures with the lens cap on just to make sure.By the way - I just noticed the latest firmware update for the Nikon V1 and J1 cameras adds a pixel mapping option to the setup menu - I wonder why they haven't added this to the D800's firmware. http://www.google.co.uk/url?sa=t&rct=j&q=pixel%20mapping%20firmware%20&source=web&cd=1&cad=rja&ved=0CDEQFjAA&url=http%3A%2F%2Fwww.nikonsupport.eu%2Feurope%2FFirmware%2FJ1%2FPixel%2FNikon1_FirmUp_En_01.pdf&ei=cD2mUIKPC-ml0QWagIGoAg&usg=AFQjCNHJLvkzsNdDoTOPEgvjvKRguUx8cA