>George >There is always the 70-200 (equivalent to 45-135mm) f/4 or the >Tamron 70-300mm f/4-5.6, you're losing stops but you get them >back with FX, and with 36mp (presuming you are after the D800) >you can always crop to get a lot more reach at the longer >end. Pray tell, how do you "lose stops but get them back with FX"? If you shoot at 1/500s at f/2.8 ISO 100 on DX, you do not get that stop back on FX if you have to shoot at F/4. Are you talking about talking about bumping the ISO because it is cleaner on FX? At ISO 100? Maybe you are talking DOF, but DOF and aperture are not the same thing. If you have to use an F/4 lens because f/2.8 would be too expensive, you cannot pretend yo get the stop back on FX. As for cropping to get more reach, that is just laughable.