im looking to buy a new lens for the express purpose of taking close up pics of bugs and primarily fish with a smattering of scenery. I was considering the Canon EF 15mm f/2.8 fisheye wide angle lens for my EOS 50D. digital photography is still something I am horribly new at. however I feel that I am a capable beginner and was hoping to get some input from those who know (so you can dumb it down for me) why or why not this would be a good lens to get. I was thinking it would be pretty versatile. often im holding a writhing fish in one hand and clicking and praying with the other. im thinking there would be less chance for me to cut out part of the fish in the picture because I can't see what I am doing with the camera. is there a better lens for my ceiling of 600 bucks? would a real macro lens be better suited for my needs? I would prefer to only pack one lens with me as lately the shots i have been taking with camera have been pretty specific.