Thanks Fred. That's actually the answer I was looking for. I was concerned that such a tiny part snapping off like that, and it's being a plastic mount, might have been the death knoll for the lens regardless of cost. Then again I guess they would replace the inner ring, the bit that actually "screws" into the camera body, which one can see is held in by five tiny screws.
I'll get a quote!
Marilynne, I'm not actually sure how it broke. It's one of those things; it was perfect during one shoot and then the next time I went to use it it was broken. The lens came with my D300, which I bought about four years aog, but second-hand, so warranty is out of the question unfortunately.
STM, I couldn't agree more! My 70-300 has a metal mount which is a whole other, so much better, ball game.
And thanks Tracsoft. I'm on it!
The reason for my minor lens-panic here btw is that I need a lens on Tuesday, so I'm trying to best decide whether to spend my time tomorrow trying to fix current lens or accepting fate and seeking out a good price new one. (Incidentally, this would be my purchase, which, for those in the UK, might be good to know.
Digital Depot )