Summary: The dust issue continues to reoccur OVER and OVER. Local camera shop will clean sensor for $90. EACH TIME this happens I need to fork over $90??? And it happens frequently. Every 1000 shots or so. I won't rehash what others have said about Nikon and the D610 but this is so disappointing after spending $2K on this body.
Excerpt: I bought this camera because I didn't want to buy the D800 and have enormous files. BIG MISTAKE!!! There are oil spots even though it is refurbished. Nikon will not do anything but clean it and they will reappear again.
Summary: I purchased the D600 body about a month ago. I had used all my savings that I have been saving for about 2 years. I was very excited to buy a full frame camera after having used D3000 for about 5 years of my life. In the beginning, when I used the camera with Tamron lenses to take event pictures it did its job. The quality was superb and the colors as well as the focusing capability were excellent.
Summary: This is a long post. The quick synopsis is as follows: The D600 HAS an issue with dust and oil. They have admitted to an issue finally in Feb. Their cust service is the worst I have experienced. After 6 months we got a full credit from the vendor and purchased a Canon 6D. We are thrilled with the Canon. The technical features are not the D600 but the Canon has not come with the free oil and dust spots that the D600 came with.
Summary: I purchased this camera to travel to South America. I had used a D7000 for a year and I have 4 other Nikon SLR bodies. Two days into the trip spots started showing up. These are not dust spots since you can see them when the mirror is locked up and they appear as small smudges on the sensor. I finally did a wet cleaning of the sensor with swabs designed for that and most of them came off. They seem to be back now. What a disappointment from Nikon.
Summary: I was a first adopter and bought my d600 in September 2012. I like to shoot long exposure which accentuates a dirty sensor After a month I finally noticed spots/oil and sent the camera to Nikon for repair and in a week they returned the camera. The spots--dust, oil, whatever were fainter but still there. I sent the camera back a second time. The second return from Nikon also had a dirty sensor.
Summary: I am a newspaper photographer and have had Nikon D200s, D300s, a D700 and (for my own personal use) a D800, and have been very happy with these cameras. I take good care of them and have them cleaned regularly by Nikon Factory Service (In my opinion, don't go anywhere else for service).
Dust/oil problems - DO NOT BUY until Nikon fixes the issue
B. K., Amazon
24 February 2013
Summary: Nikon has finally admitted to the well-documented problems with spots on the D600 sensor. Look at sites like dpreview, lens rentals, and the reviews here and you will see this is a real and serious problem. My D600 was sent in for service three times and was not fixed, so they do not have a solution for it yet. I was getting spots on my sensor every 200 shots and these spots would not come off with a rocket blower.
Thought it wouldn't happen to me, but it did...oil spots
Peter H. Ly, Amazon
22 February 2013
Summary: I thought that I had a clean camera, but it was not the case. I bought the D600 from B&H. After about 3000 actuations, I saw spots which appear like grease or oil on the photos (about 40-50 spots). I tried to use the rocket bowler to clean the sensor but the spots were still there. I had to send it to Nikon for sensor cleaning, no questions asked. Very disappointed in this camera and the way Nikon is handling this.