« on: February 13, 2012, 08:02:50 AM »
I own a 7D and a 70-200 2.8L IS II and both the 1.4 and 2x mk.III extenders, and i will tell you in a heartbeat to go with my lens and an extender. However, i will recommend you go with the 1.4 rather than the 2. Keep in mind that your cropped body turns this lens into a 113-323mm 2.8 without an extender, so you'll be around a 158-452mm f/4 with the 1.4 extender on and still produce sharp pictures. I have only had the 2x extender for a week and only used it on one outing, so i can't recommend it. I will say though, that inital photos don't seem to be sharp at all. Actually, i hope this might grab the attention of someone with the mk.II 70-200 and mk.III 2x extender to respond here, as i am interested to see if others say their images are sharp or fuzzy looking with that setup. In short, go with the 70-200 2.8 is II and the 1.4x III and you will be very happy.