Oostwold 2009 was the first show for me with exeptional good weather also it was the first time i could try my wonderful 300MM f/4 AF-S Nikkor combined with a 1,4 extender i can reach at 420MM at f/5,6 well that's 630MM at 35MM equivalent.
I really love this lens it's really crisp already wide open and has a lovely bokeh.
I recommend it to anyone who can't afford a f2,8.