50mm f/1.4 is the first lens I buy with a new camera system. To get good photos of human subjects you need to use a fast enough shutter speed 1/125 or 1/160. H

50mm f/1.4 is the first lens I buy with a new camera system. To get good photos of human subjects you need to use a fast enough shutter speed 1/125 or 1/160. Here a fast lens comes handy in dim light. If you direct the subject and he is posing, then you can get away with 1/15 if you have steady hands, optical stabilization and you are willing to take more shots. It's important to have a camera with a fast and accurate focusing system and a fast focusing lens. If the light is scarce, you can use strobes and light modifiers such as soft boxes. Image quality is a function of exposure which is a function of shutter speed, aperture and scene illumination. The more photons are hitting the sensor, the better.