Great product! It’s the size of my hand and so portable. Love it. The only thing is I wish it had a lens cover

Camera has a great feel to it and I love the way it looks. I got a hand mount since I will be using it for skimboarding but otherwise I love it as a whole!

First, find a good mounting place. Second, buy the Drift handle bar mounting bracket. Except for lack of direction in manual on how to rotate lens, directions were ok, just not that descriptive. Also, 256gb SD card works fine despite manual indicating 128gb was max. Rotate lens by grabbing with thumb and forefinger and spin slowly 90 degrees. I thought there might be a software way to rotate the lens, but Youtube video helped.

Second one of these I have ordered and works great. Last one broke while in the bag but protected the lens so it did exactly what I wanted it to do.

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.

if I only had one hand, that is, which is often the case.The other is just so often occupied with so much lens.A little sticky on closing the feet as well.

I really appreciate how easy it is to use. You can mount and unmount your phone with one hand.

Many have already commented on how silent and "fast" this lens is. Agree that its heavy, but using a hand strap allows for greater stability. Build quality is excellent as it is for every other Canon "L" series lens. Some quip about the white color and it does attract a lot of attention.A few things surprised me, the date code on the lens that I purchased was no less than two weeks old from where it was manufactured in Japan. This is a big lens that looks like a bazooka with the hood attached. Despite its size, it is very well balanced on my 1D Mark II. I've taken pictures for 2-3 hr stretches and it does cause some fatigue in your forearms, wrist, and hand muscles.The bokeh is dreamy and the IS has allowed me to capture images that would have been less likely without the IS. Same image with and without IS and you'll see the difference -- especially in low light conditions or at shutter speeds less than 1/100.Lastly, image quality and sharpness appears to be dependent on sensor size. Images from full frame sensors (1D series and 5D) are sharper and less soft compared to those images taken with APS-C sensors (Rebel, 30D, 40Detc). This has to do with pixel density and the "magnification" which exaggerates perceived softness.This is every bit a professional lens -- great build quality, sharp, weather-sealed, and of course the price. There are many debates about IS or non-IS and 2.8L or 4L. Yep the 4L has better MTF graphs, newer generation IS system, and the images are stunningly crisp. But if you shoot in variable light conditions, the 2.8 won't let you down. Just ask the pros...