I have canon 1ti camera, two days ago i bought me a canon 50mm f/1.8 lens, but I am getting very discourage by my co workers since they know about photography moreI do ( i am just a beginner). They all saying its not worth it since my camera is not full frame. They also saying something like its not 50mm its actually 80mm some crop factor not sure exactly what they mean. Can you please give me advise what to do I am and also explain me what they mean by "its not 50mm instead its 80mm". Should I keep it or return it, I have 4 days left before I can return as you know B&H has 7 days return policy.