http://www.nikonchat.com/nikon-d7000-cmos/

nikon 70-300mm vr Nikon mount the D7000?
Hey, kid, if a 70-300mm VR Nikon mount nikon d7000 len at the end of 300 mm is 450 mm, as len production assembly that the DX Nikon D-SLR Nikon D7000 and is a DX-format CMOS any advice much appreciated.
Yes, indeed, as any focal range of the lens must be multiplied by 1.5 times and a 70×1.5 300×1.5 be the equivalent of tele photo lens since you are using a DX cropped sensor (which would be 105-450mm). advantage is you get a longer focal range. disadvantage is that you can not get the larger end of the lens. HTH
Nikon D7000 16.2MP DX-Format CMOS Digital SLR with 3.0-Inch LCD