One of the things every experienced photographer knows: Unless you have full control of the lighting situation, you'll want more light way more often than you'll want less of it. A lens that delivers plenty of photons to your image sensor is a good thing to have. This very bright, 50mm-equivalent "normal" focal length lens is designed to get you great results and creamy defocused backgrounds in situations where using a flash will disrupt the flow of events. The first time you see the mood and atmosphere that comes from shooting in natural, subdued light with a lens like this, you'll know you want to use it more.