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I have recently purchased a Sigma 70-200mm f 2.8. It has been working great on my D7100. When I tried to use the lens on my D600, I get a funky "flickering" of the AF info on the LCD of the D600 and no AF. If I turn the AF off, the flickering stops. Suggestions? TIA

Greetings all I shoot a lot (almost all) of outdoor photos and consequently do a lot of hiking with my D7100. Last week I was out and when hiking from spot to spot, I left my camera on the tripod and hiked like that. Several times, when I got to the next location, my camera showed an "ERR"...

Sorry if this is a dumb question but I have browsed the groups and cannot find the answer to this. I have a D7100 and I bought a Nikon AI-s 105mm f/4 lens and PN-11 to experiment with macro photography. When the lens is off the camera and I turn the aperture ring, the aperture opening does not...