Was trying to make up my mind on this combo over the Canon 100-400 since I got the same reach plus I'd have the 2.8 with just the lens. I ended up goiong with the MKII lens and MKIII 2X since I heard the 2X MKII wasn't as sharp. I've had them now for a few months and can't complain. I've actually looked over at the 100-400 page and feel that the IQ I get from this combo meets or exceeds some of the pics over there. I had a difficult time finding any pics or threads dedicated to this combo so I hope this helps!

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