Also the general rule of thumb for SLRs in regards to a fast enough shutter speed is linked to the length of the lens. The longer the lens, the heavier it is and thus more vibration from your hands is created and thus a faster shutter speed is needed. Hand holding for a 100mm lens usually requires atleast a 1/125th shutter speed etc. Tis is a general rule and with some image stabilization lenses you can break it, but its a good starting point for beginners.