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The Nikon D750 DSLR camera is fully compatible with Nikon AI, AF-S, AF and E-type lenses. Nikon AF-P-type lenses may require a firmware update to be fully compatible with the Nikon D750 camera. To learn more about lens compatibility please contact Nikon Support.
Sorry, there was a problem. Please try again later.You can use the lens that you have for your D3100. If it is noted on that lens that it is a DX lens,since the D750 is a full frame DSLR, you will see a cropped window through the viewfinder as the lens you have was made for a camera with a smaller sensor. In every other aspect, the lens is compatible.
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