I am a professional photographer. It is very complicated with a lens to focus. 
Oh my goodness! I do photography for fun and I don't know much about it at all. I was actually looking today to get new lens for my camera! I couldn't decide if I should spend the money to get new lens because I am happy with the lens I do have and am not sure if buying these new lens would really make a difference in my experience taking photos. What camera do you have?
Photography
Photography is the art, application and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed in many fields of science, manufacturing (e.g., photolithography), and business, as well as its more direct uses for art, film and video production, recreational purposes, hobby, and mass communication.
Typically, a lens is used to focus the light
There's a little pressure now to widen my work, with agents and artistic directors asking if I want to do Chekhov. I can, but I don't want to. There are only a few people who get chances to be where I am in my career. I want to use it for putting the lens on black people and showing them in all their beauty, their facets and warts. These are people who I care about and love and want to see in all their complexity on the stage."