I was shooting with one of my D300’s this morning, all was going well until I noticed shadows in my images when I was reviewing them on the LCD. I took off the lens and noticed one of the shutter curtain blades was stuck at the base of the mirror box. I have seen this with film cameras back in the day as I know a blade can get off its track. It was an easy fix - take a precision screwdriver and gently nestle the blade back in place. Of course, you could remove the back of film SLR. This D300 has less than 40K shutter firings and should not have happened - my other D300 has close to 90K and still chugs along. Is this even fixable and economical to do so? It’s a shame that I have to give up on this body....I bought it with less than 9K firings and I should have got more life from it.