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Message: <blockquote data-quote="BackdoorArts" data-source="post: 211245" data-attributes="member: 9240"><p>Try this.  Shoot a photo of a piece of white paper, first at minimum aperture and then at maximum.  I suspect it will only show on one.  As Marcel stated, it's likely dust on the sensor which can usually be remedied by a simple blowing off of the sensor with a bulb (not your mouth or compressed air).  There are plenty of threads here about removing dust from the sensor, so poke around a little, particularly in the D600 forum. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink    ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>