Quote Originally Posted by alexfoto View Post
Thank you all, that's a good idea to tern the camera upside down than to take a hood!! after all i have the camera in my pocket and its a problem always to reattach the hood.
I think its problem of the front element because i unscrew them to clean and i can't put back in the same place, i lost the correct position in witch i have to screw again, and the meters is not so correct now i think
You omitted to say in you're original post you had dismantled the lens, if lenses are dismantled the need to be re- collimated on an optical bench to ensure the elements parallel to each other and centred to a datum line.