Are you getting the center filter for the lens? I would get one, without hesitation. That will slow the lens down even further. You can still hand-hold shots using 100 speed film, but it will depend on the lighting conditions you have when you're doing your street photos. I'd also look around for the lens shade for the 45. With such a wide field of view, it's more likely to have some sun or other light source(s) in it.