here’s a link to HD lenses

here’s a link to HD lenses at B&H. You want a 1/2″ lens because the EX3 has 1/2″ sensors. Most of the lenses on this page are 2/3″ but you should be able to find a couple 1/2″ lenses to choose from. Take your pick:

http://www.bhphotovideo.com/c/shop/2672/Lenses_HDTV_Cine_Lenses.html