>Think of the DX nomenclature on a "DX" lens simply >being there to designate what format camera it should be used >with and that is all.
Exactly my point.
> >With regards to your comments regarding the SB900, this has >absolutely nothing to do with whether a given lens is DX or >not. It has EVERYTHING to do with format of the camera body. >The flash picks up the focal length a lens is being shot at >and make necessary adjustments whether that "50mm" >is on a DX body or on a FX body. This does affect things.
Again, exactly my point. At any given focal length, the lens projects a narrower field of view on an DX body and the flash can zoom in.
The OP said that a 50mm DX lens on a DX body has the same FOV as a 50mm FX lens on an FX body. That isn't so. That was my point.
A 50mm DX lens might be smaller, lighter, and less expensive, because it does not have to have the same image area. It does not produce the same FOV on a DX sensor as a 50mm FX lens does on an FX sensor though.
Scott Chapin Powder Springs, GA, USA Nikonians Team Member