I have the 70-200 f4 non IS as my budget was tight at the time. I have taken some great shots at the Red Bull Air Show with it. It is a fantastic sharp lens. I used a tripod for these, but have since taken some great shots without the tripod. I have got into the habit of taking consecutive shots because I do find hand held when there is a breeze a bit of a challenge. However most of my shots are hand held. I have even had one of my first photo's with this lens, enlarged to 15x11 and framed, I am thrilled. So the price I paid for that lens, I am extremely happy.