Hi all, I'm looking for a new portrait lens for my Canon 10D. I'm currently using the 50/1.8 and need something wider. The area I use for my studio is too shallow to allow for a full body shot without having the subject against the backdrop. Would rather have a prime lens than telephoto as I already have the 28-135 and it's a bit soft on portraits. Any advice would be greatly appreciated. Thanks in advance.