Excellent prime lens @ $150! I use it with my M100.

If you have less than a full frame DSLR consider this to beca nice prime telephoto lens. 50mm × 1.6 is the crop factor.

Nice telephoto lens for the money I had been looking for a while couldn’t afford the others like 2500.00 and up this on does just as good and a lot cheaper

This is simply the best telephoto lens I have ever used. It arrived about 3 weeks ago and has performed flawlessly on both my 30D and my film camera (the old EOS 630). The blurred backround at wider aperture settings is satisfying and seamless, while the contrast, color and sharpness of the image are remarkable. There is a very slight, but barely perceptible, softening of the image on film when the lens is wide open at f=2.8, but by f=3.5 I can't detect any lack of sharpness even on enlargements.The IS works perfectly. There is a little motor noise (very soft) while the IS is engaged, but nothing that would disturb a nearby subject. As others have stated, IS is no complete panacea for hand-held shooting in near total darkness, but I have been able to get a lot of great exposures that would have been impossible with any other telephoto.Another huge plus is that this lens allows full time manual focus; you don't have to flip a switch to override the auto focus. All you need to do is start turning the focus ring. This saves a lot of time and missed shots when the autofocus is choosing something other than what you want to shoot.On the other hand this is not a "walk-around" lens. It is very serviceable off the tripod for short sessions, or even hanging around for a couple of hours. If you watch Art Wolfe on "Journeys To The Edge" (highly recommended show on PBS)he uses this lens a lot, and often hand carries it around without using the neck strap. But it does get heavy after a while. And it is a long,fixed length lens. But the weight and length are just the price we have to pay for a lens that retains its maximum 2.8 aperture through its entire range.If you are serious about the images you create, and can afford the price, this lens is an investment you cannot afford to pass up.

Definitely a good lens, probably use it more than telephoto lenses.

Great lens, I needed a telephoto and everyone pointed me towards this one. It is probably my largest single investment so far in photo equipment but so far its worth it.

i love this combo. the lens's give me everything I need to shoot. kinda wish i had a telephoto but this works for now! thanks canon

I would recommend this lens to people who just starting photographyIt's not as expensive as some of the other prime lens for EF-M mount