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<blockquote data-quote="Geoffc" data-source="post: 314290" data-attributes="member: 8705">A few points. I doubt if focus is much of an issue on the Tokina as everything tends to be in focus unless you try hard as you have lots of depth of field. The ISO performance of a D7100 is not bad at all, about a stop behind the D800. A D2.8 DX lens is cheaper than an F4 FX lens which equals that out a bit.The autofocus of a D7100 is better than a 600/610 and at least as good as an 800. It also give fine tuning.I wouldn't buy an FX body to make use of fairly cheap (but very good) primes as the rest of the FX glass will cost lots.One thing FX does give is shallower depth of field where that's an advantage.I'm not trying to say that FX does not have any benefits, however they are much less than even two years ago.You can get FX fish eyes at 16mm.Sent from my iPad using Tapatalk HD</blockquote>

[QUOTE="Geoffc, post: 314290, member: 8705"] A few points. I doubt if focus is much of an issue on the Tokina as everything tends to be in focus unless you try hard as you have lots of depth of field. The ISO performance of a D7100 is not bad at all, about a stop behind the D800. A D2.8 DX lens is cheaper than an F4 FX lens which equals that out a bit. The autofocus of a D7100 is better than a 600/610 and at least as good as an 800. It also give fine tuning. I wouldn't buy an FX body to make use of fairly cheap (but very good) primes as the rest of the FX glass will cost lots. One thing FX does give is shallower depth of field where that's an advantage. I'm not trying to say that FX does not have any benefits, however they are much less than even two years ago. You can get FX fish eyes at 16mm. Sent from my iPad using Tapatalk HD [/QUOTE]

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