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Message: <blockquote data-quote="BackdoorArts" data-source="post: 298382" data-attributes="member: 9240">Welcome.  I feel like I'm repeating myself, so please don't take the tone of this personally, it's meant for anyone and everyone who reads this.  The D600 problem has created a world of nervous photographers who seem to have forgotten that DSLR's get dust and dirt in them.  No matter how careful they are in changing lenses, stuff gets in.  In normal use, long exposures, LiveView and just pointing at things up in the air and allowing gravity to take over will introduce anything that's managed to find its way into the cavity of the camera or that gap in the back of the lens between the cap and the first element, to the sensor as the mirror and shutter create a millisecond long gale inside the body with all their flapping around.  It's normal stuff, and you should be prepared to spot it, and to deal with it, first with a simple bulb blower and then with proper wet cleaning tools or a bit of money and a local professional.OK, so with that editorial comment aside, what you have Gerry is more than likely simple dust or some other particulate.  You're out in nature with grazing animals and trees, all of which will create dust simply from the kicking up of dirt on the ground to seed pods breaking open in trees to pollen of every possible sort.  While people will tell you to use the Self Cleaning function (it barely works, and will only really work of you use it with the camera facing down to allow gravity to pull that spec off - but remember, it's still inside that wind chamber for the mirror and shutter to blow right back onto to the sensor) you need to get a good bulb blower and blow the sensor clean (do not use your mouth or compressed air - both are moist and can get into the sensor stack), again, with the camera facing down so gravity removes the debris from the body.  After that, if it persists, either learn how to do an occasional wet clean, or find someone local to do it as required.DSLR's are not closed systems like Point & Shoot cameras, and this stuff gets in all the time - on every brand and every quality level.  It's the thing they don't advertise when you make the jump.  It's OK.  It's not Nikon's fault, and it's not your fault.  It's like making dinner and getting the stove dirty - it's a part of the process, and at some point you're going to have to clean it up.  When all depends, because some meals and some chefs are messier than others - but you will have to clean it</blockquote>

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