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Message: <blockquote data-quote="wornish" data-source="post: 372587" data-attributes="member: 15434"><p>Covering the eyepiece is an essential first step but looking at the two examples you posted I would say its sensor noise.  All cameras show this at high ISO, and taking a 30sec shot at 12800 would be very noisy on most cameras.  Thats why they have the Long Exposure Noise reduction option.  It takes another shot of the same duration straight after the first shot but keeps the shutter closed and then subtracts the second one from the first to give a much less noisy image.  Not sure if the D3200 has this option,  but if not you can do it manually by taking a second with the lens cap on and then loading both shots into layers in Photoshop and inverting the second noise only shot before merging the layers.</p></blockquote><p></p>