1.fish eye adaptor is good choice, just HK$890, discounted in sony show room
2.a nikon adaptor, so that you could use your lens (no auto focus, but Nex is so easy to manual focus)
3. do you need body cover and lens rear cap? I placed order to sony, I got one extra set (will be available next week), HK$40 x2 per set. pls let me know.