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?
My camera was made in 1987. Standard lens mount. Which is very light sensitive.