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"RE: Strange over exposed arc artifact at fast shutter speeds in d5100?"
This artifact can't be>normal.No - there's something up there. The only physical thing I can think of is a fine hair but if you've looked and cleaned the sensor that seems unlikely.The arc is opposite to the lens circle so that seems to rule out anything associated with that, but you've tried different lenses anyway.How does an artefact like that get created either in firmware or on the sensor? A crack or fault on the sensor?I hope you get a fix with Nikon - that's probably the path to pursue.Philip