Chris, I don't know anything about this lens, but I'm sure if you hit Google, you will find loads of info... I used a 70-200mm on a 1.6 cropped sensor before at an airshow, finding that I needed a bit of extra length. I think the 300 will be ok for you. The 'APO' stands for Apochormatic which are higher quality lenses that the norm. Depending on the weather, you might need bigger than f/4, but you may have to boost ISO up a bit... f/4 will be OK however....
Cheers...