Greetings,Is the large price jump between the Canon 70-200 f/4 L USM and the version wth the Image Staberliser, the 70-200 f/4 IS USM, worth it?Do I need it? How can one tell? Cost is an issue for me.Rgds,Paul[a href=\"index.php?act=findpost&pid=87062\"][{POST_SNAPBACK}][/a]