Irvine said:no. it's the fact that u r using a DX body.
i repeat: focal length does NOT change. only field of view is affected.
be it a FX lens or a DX lens, as long as it's mounted on a DX body, the field of view on DX is the same as the field of view on FX of wadever focal length u use on DX body x crop factor of 1.5.
just that u enjoy the "sweet spot" advantage using FX lenses due to the smaller size of the DX sensor.
You almost got me confuse here. 17-55mm is a DX lens. Thus, mounted on a DX body gives you the focal length of 17-55mm.
If the DX lens mounted on DX body still x1.5 the focal length, then why bother buying it when you can get the FX instead?
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