... I purchased this lens because I do a lot of candids and 200mm is just not good enough. I also recently purchased a 5D MkII, so any praise I may have for the lens may be partly due to this camera. When I read some reviews of this lens, I was worried that it was weird. I will mostly address these issues. Is it heavy? No. I use a monopod and hand carry a 100-400 lens without problems. This lens is only 52 mm at the front,so it has amazing reach for its size. Does the zoom feel heavy? No. The zoom needs some resistance, since the front of the lens would extend by itself if it was too light on the zoom control. This is the same issue you have with the Sigma 18-200, another great all purpose lens for candid shots. Both lenses have a lock button that keeps the lens from extending when you not taking pictures.
Lastly and most importantly does the diffraction type lens cause any problems? No. I have literaly seen no problems with lack of sharpness or unusual flare. I think you would have to shoot tripod test scenes to reveal this. Using a monopod in real life conditions,the issue does not appear to exist. Admitedly with back ligthting you can get some fogginess and flare,but this is just like other lenses. I think some ot the reviwers who are critical spend too much time bench testing. When I am doing candid,or travel photography,especially with a full frame camera,this may become my main lens. ...
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