I own the 50mm 1.8 G and I rarely use it wide open. I always see photos on here and in magazines where the photo was shot at 1.8 or something close and it's sharp. I posted this because I just saw a portrait show with an 85mm 1.8 and it looked great. I have a question about taking photos that open. How do you make sure that the photo will be sharp and in focus where you intend? I always seem to be close but never nail it. That's why I usually don't go below 2.8. Help?