Forum members please help. I just purchased a new canon EF 24-105 F/4L lens and I can't get sharp pictures unless I use a flash. My outdoor pictures are especially soft even at aperatures above F5.6. I used the hood outdoors and took off the lens filter. I have a canon 20D camera and this is the only lens I have had any problems with. My18-55 kit lens does better. This new lens is just too expensive for this kind of problem. I understand DOF issues when shooting close subjects but that is not the problem either. Please advise before I go nuts about this issue.