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I'm planning to buy the Nikon D5100. As I'll also buy a 200mm lens which format to go for ? And what does they mean and their differences [DX Format FX Format CX Format]

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The only difference is the addition of the "CX" format, which are lenses for the Nikon 1 (1" sensor) system. – Stan Rogers Feb 20 at 15:38
Good point, Stan. CX lenses won't work; the other question answers the rest. – mattdm Feb 20 at 15:40

marked as duplicate by mattdm, Itai, Stan Rogers, Matt Grum, MikeW Feb 20 at 18:37

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For Nikon DSLRs you'll want to get an F-Mount lens. Both DX and FX lenses are F-Mount. The new CX lenses are not. The D5100 has a DX format sensor, but FX lenses will still work. The D5100 doesn't have an internal focus motor, so if you want auto-focus to work you will need an AF-S lens, which has the motor in the lens itself.

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