I have been shooting with my D90 for nearly a year but recently the viewfinder has gone really dark making the shots super dark even when shooting with flashes (and yes I am shooting with the right settings). The lens has also become stuck to the body and wont come off. I'm in france at the moment and when i took it to a camera shop the guy just said stuck and no more help which was a bit annoying. But yeah I dont know what to do about it so any help would be much appreciated.