Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: Does it work on a Canon 50D and also on Canon 5D?
Document: For reference I own a 70D and 6D, and also my older 5DMark II and 40D. In upgrading, I elected against the 5D Mark III because of the lack of Wifi/GPS (remember why I shoot), and some other nits, but that's another review altogether.
I can't even believe it when this lens focuses - it catches the object before I do! Along with my 50mm 1.4 and 16-35mm 2.8L, I have a dream team that will travel the world with me. Great job, Canon, keep up the amazing work!P.S. : Are you debating between the non-IS 2.8 and the IS 2.8? The difference comes when we look at prices. The IS version is almost twice as expensive!
01-01-2009 Canon 5D Mark II UpdateBokehWell, the reach my be less but man on man the Bokeh of this lens using the 5D Mark II has to be seen to be believed. Much smoother creamier and richer on the 5D Mark II.
I love this lense. I use it with the 5D MkII and 7D bodies. It delivers crystal clear and sharp images. She is a little on the heavy side compared to my Canon 400 mm f5.6 lense (zoom vs prime). Plus, the 70-200mm has a low f/2.8.
SWEET!! !Verdict:You can't go wrong if you need 70-200mm and fast speed.01-03-2009 Canon 5D Mark II Update:This lens is actually just behind my Canon 100-400 IS L Lens in the zoom sharpness and clarity department but it's no where near as versatile on my 5D Mark II as the 100-400.
The non-IS lens is heavy enough as it is. I use a monopod and boost up my ISO on my near-noiseless Canon 5D, and viola, I've gained the same 2 to 3 stops that IS can give you, and at a faster shutter speed to boot. Oh, credit where credit is due, I'm fairly sure the IS version has weather sealing where the non-IS does not.
Using this with a Canon 5D MkII. This lens stands out above my other EF glass for sure. I'm shooting both video and stills with it and it works great in both situations. With video, the lighting is often minimal, so the fast 2.8 aperture really comes in handy. If I had a 5D MkIII with much better high ISO performance, I'd be tempted to say the f4 version might be good enough.
When shooting outdoors if you can't get pretty close you will want a longer lens. This is when I reach for my excellent Canon 100-400 F/4.5 - F/5.6 IS L Lens.Vignetting:On my Canon 40D and Rebel XTi Vignetting or peripheral illumination problems are practically non-existent, but on my new Canon 5D Mark II I use the auto-peripheral illumination correction as with it off it is a problem.
It is super sharp and focuses very fast. I've had no problems whatsoever and have taken some of my best work with it.
Fast service, very nice lens, awesome pictures and also works will on canon t3i, great for sport photos. . .
Answer: Yes, i use on 6D & 550D