Does anyone have any probs with tight fitting lenses?....i got a 50mm 1.8 for my D50 a few weeks ago, and when you put it on its a bit of a struggle. Starts getting real tight way before the 'click' sound of the attachment. Only worrying side effects at the moment is like yesterday when i took it off to swap it for another lens, the other lens goes on nice and easy but the autofocus was temporarily knocked out?....i had to take that lens off again and reattach it...then it worked ok. This is the second or third time its done this....... do you think the 50mm is damaging the connector pins?....does anyone else have a tight fitting lens?...... all comments welcome.