So I just got my first big boy camera, a Canon XSi with a 50mm f/1.4 lens. I'm impressed with the amount of light the lens captures at large apertures, but I'm having trouble getting a sharp image, even when I focus manually. I'm not sure if the lack of focus is due to not focusing properly, or because I'm not holding the camera still enough. By the way, I'm shooting mostly in aperture priority mode. Should I be shooting in manual mode instead, so I can increase the shutter speed and ISO? How does everyone else shoot casual indoor portraits in low light?