http://www.sigma-photo.com/lenses/lenses_tele.asp
ｄｕｎ ｋｎｏｗ ｗｈｙ sigma 105 F2.8 macro is not in the list , maybe not 100% compatible ?
-easy to register , free
-all participants is going to a place to take photo , really depends on your creativity on that day(s) only , fair for everyone
-paul , interested ?
只是佳能..?
i think sigma , nikon and canon also “should” support de