Thanks notsotechie.
I came accross the following review by Andrzej Wrotniak.
The Old Bigma and the New Bigma:
wrotniak.net: Sigma 50-500 mm F/4-6.3 DG Lens for the Four Thirds System
I am wondering if anyone here has used both versions. If so is there any real difference. The one review I found (on Sigma DG Vs non DG Tele Converters) says there really isn't much difference.
DG vs non-DG TCs Photo Gallery by Miljenko Devcic at pbase.com
Thanks.
Wasim.