Product ReviewsCanon EF DO IS USM 400mm F/4.0 IS USM Lens

Excellent lens

You might see reviews saying that this lens lacks contrast. If it does, I havn't witnessed it and I dont know why you wouldnt compensate in PP anyway. Compared to the 500mm f4 which I also have I dont see any difference in image quality at all.
Best of all, stick a 1.4 t/c on the 400mm DO and you have a 560mm f5.6 *handheld* prime lens offering fast sharp focus. And this lens is extremely sharp.
As for the other comments here about the 100-400 f5.6 not being sharp, either it's a dud lens or there's a problem with someone's post processing.Read full review...

Verified purchase: No

DO Best lens ever

Forget all the photo magazine write-up of the 400mm DO lens. I have both the original lens and the latest lens. Both are excellent and are my everyday go to lenses - 600mm II lens hardly comes out of its box! They are relatively light compared to my 600mm lens. I use my lenses for fast sports and wildlife. Add 1.4 or 2 x extender and they still produce stunning results. Best lenses I own, just wished Canon would make a lightweight 600mm DO lens!Read full review...

Verified purchase: No

Superb quality Canon lens.

I need a lens for wildlife for long distance. It´s working
well with Extender 1,4 III(560mm)by same quality.
This lens is a must to have. The weight is not important, but
only the quality of the pictures. I had bought this lens as
needed for a good price. If you have a chance to buy this
lens, buy it.Read full review...

Canon 400 mm f4 is

I have a Canon 500mm f4 and did have the 100-400 f5.6 zoom. I hated that latter lens. I could never get sharp photos, I wasn't convinced the IS made any difference and, though I carted it around, I never used it. However as I needed something lighter when I was out birding all day I opted for the 400 mm f4. It is lightweight, easy to carry and handhold and like all the big Canon lenses it is well-made and focusses really fast. It also takes good photos BUT I don't think they are sharp or as clear as the 500mm f4. Maybe it's just cos I'm still getting used to it. So if you can only afford 1 big lens, if quality is the main driver, get the 500mm work out more to build your muscles and learn some of the "large lens hand-hold" techniques esposed by people like Artie Morris or Alastair Benn. However if portability is the priority the 400mm is great although there is a slight compromise with qualityRead full review...