Quick to install. Works great. Great quality.You should really consider making a telephoto lens.

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.

I'm giving this 4 stars - 5 stars for what it does, and 3 stars for the fiddly.I use a Panasonic Lumix G6 MFT camera, and use full-size DSLR lenses with adapters for telephoto along with the occasional adapter that doubles the focal length of the kit lens. Hey, I'm on a budget!The Booster absolutely performs as advertised. When I first got it, I noticed that it was, well, *plasticky* and didn't feel very strong. It came with two adapters for the hot shoe (which I promptly misplaced but found again), and full directions. It took a bit of fiddling with the shoe mounts to get it seated correctly on the camera. I found that the only way to get it to perform properly was with one of the shoe adapters. With an adapter and the Booster in place, miracles happen.Everybody knows that the pop-up flash that every camera comes with is pretty much crap. Well, this little item with the War of the Worlds looking fresnel lens solves a lot of the issues.This will not work with your regular kit lens. This is meant for telephoto distance shooting, and that's how it best performs. Anything shorter than telephoto means that you'll have a blown out white circle in the middle of your picture! Ask me how I know...The pros of this item are pretty simple: It gives your pathetic pop-up enough power to brighten telephoto pics. After the fiddly part is done, it works perfectly. And it's made in the USA. Boom.The cons are simple, too: Plasticky feel, but may be stronger than it seems. It works on telephoto and ONLY on telephoto. Wish that they'd make one for wide angle!So to sum it up, I'm completely happy with the device and like the way it works. I just wish that the fit and finish would give me a little more confidence in its longevity. If it lasts, I will update it to five stars.

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

no camera shake in extreme telephoto useing this remote. bought with an adapter to mate phone to binoculars for cheap telephoto shots of birding at nearby refuge. High telephoto with binocs makes camera shake when pressing shutter key. with this little clicker, I can shoot at equivalent to 600mm with no camera shake. Pretty cool.