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When you say long exposure noise reduction is off - you checked the C.fn bit (is it the eight bit on that model 001100000 etc) is set to 0 not one?
When you do a 1 minute shot does it go for 2 minute, does a 5 minute shot expose for 5 and subtract noise for 5 = 10 minutes - in which case the noise function is still active. Better problem diagnosis will allow better help feedback from folk here.
Matt
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