Hi, I have just purchased a 75mm-300mm zoom lenze. When I switched to manual settings both on camera and lenze the back screen turned black with nothing showing at all, I took several shots and they all turned black as well. I did remove the lenze cover which would be an obvious error. I have obviously, accidently, done something to make this hapen but I know not what. I am a newby to photography so if anyone can suggest a solution to this problem I will be more than greatful.
