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nikt wrote:
Yes, if you override the 'automatic dx' funtcion, you can use the FX mode with the full 12MPs.
Expect, from most DX lenses, 7 of those megapixels will be black.
They may not be black, as many DX lens can cover the full FX frame, at least at some focal lengths in their range. Even the cheap 18-55mm for example works fine in terms of covering the FX frame at the 24mm setting
Problem is though that while it does cover it, the resulting image simply is not very good in the corners, and in most cases is not really even usable.
Only real exception I've seen in the 35mm f1.8 DX which does have some vingetting in the corners, getting quite bad as you focus towards infinity, but the overall image quality of whats projected is pretty high.
I actually use that DX lens as my full frame 35mm lens in fact, but as I said, its certainly the exception and not the norm
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