yah.. I believe you can only shoot certain size of insects, correct me if i'm wrong.. i normally set the F to the highest aka smallest aperture.. and use flash with diffuser to lighten up the insect.. hope this answer your qestion
ok.. i thought i doing things wrong when i saw only a small part is focus while the rest is blurred. I'm still a 2 day old raynox 250 user and 1 month D40 beginner. hahaha. Hope to learn more from your guys.