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Message: <blockquote data-quote="randyspann" data-source="post: 289747" data-attributes="member: 21503">Hi Smoke - do you have "long exposure NR" (noise reduction) turned on?  If you do, the camera creates a "black mask" to subtract noise from the shot.  This takes exactly the same length of time that the exposure took.  The idea is for the camera to get the "noise footprint" at the time of exposure and use that to reduce noise.  The alternative would be to turn that setting off and check results (you could then see if post processing gives you an acceptable result.)  That's one possible answer to your question.</blockquote>