Yes, You're right. I'm just now learning about the necessity of cleaning the sensor when needed....But as I am about to box up and return this D800 in exchange for the new D810 I'll pass on it, I will first check my D7100 and see if I have an issue there. I ordered the Delkin cleaning kit and a good brush as it seems that a fairly small investment is a no-brainer in protecting such a large investment.Looks like you might need a sensor clean...either that or I need to clean my monitorThat;s a nice shot. I like the lights on the water
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