I just bought one off ebay and there are several versions of this lens out there, but I thought it would be nice to have a thread to share photographs. Tell us which version you are using with your post. This is a test shot I took of a backlit Junco this morning using a mint 300mm AF II SD model (gold ring) paired with a 2x kenko MC4 teleconverter. I am looking forward to putting the combination through it's paces.
600mm @ f7.1 on a 7D and about 40% of frame and I adjusted the contrast but left the colors neutral.