Originally Posted by JJphoto
update, since I got very good result with the 500mm+1.4XTC combo for shooting closer small birds, I thought I can get pretty good result for shooting distant birds or BIF, but I 'm kind of disappointed so far with the results. I don't know what other people who has had the 500mm for longer time think about it, I feel it's so hard to do BIF on a tripod, hand holding the 400mm 5.6 was so much easier IMO, but then I may need more practice. anyway, just think you may want to know this before you buy and no doubt this 500mm is a great lens.