The nice thing is that the GW3 screws directly onto to the Sigma lens, i.e. no adapter is needed, which keeps the camera reasonably compact and balanced.
I don`t notice any difference in AF with the GW3 mounted and corner performance is fine for my needs. Although I did not do any "tripod with newspaper on the wall tests". The GW3 wide angle works equally well on the DP2M. The attached shot gives some idea about edge and corner performance with the DP2M.
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