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Message: <blockquote data-quote="480sparky" data-source="post: 327895" data-attributes="member: 15805">That could be simply due to the shortened exposure time when you 'dial down' the filter.  You're changing the exposure based on it and how much light comes through the lens, but you're not changing how much light comes in through the viewfinder.  When you dial the filter up towards 'max', you're cutting down the light coming through the lens and adjusting the exposure accordingly.  But you're not reducing  the amount of light spilling in through the VF, so a longer shutter time will cause it to expose more light.An easy way to test for this is to set the camera up, and take a long exposure with the lens cap on.  If you get a black image with splotches, it's light coming from the VF.</blockquote>