I was looking for a very snug portable case so I could put the 28mm pancake lens on my Fuji X-E1 and just toss it into my purse. Effectively turning it into a very very good ultra-portable. This fit the bill perfectly and I imagine it would work for most small mirrorless cameras and while I am using a pancake, there's definitely room for a lense up to a few inches in size.

This is unquestionably the best lens in my arsenal, and I own several other Canon L-series lenses. It's not the lens with the most versatile focal length range, nor the most convenient thing to haul around, but for shooting with a full-frame D-SLR, no other zoom can touch its optical qualities and feature set: astounding edge-to-edge sharpness, freedom from vignetting, great color and contrast, large max aperture, fast auto focus and two-mode image stabilization that really works. It's so good optically, it makes me smile every time I find a reason to use it. Not everyone will want to put up with its considerable weight (it feels like it's carved from a solid block of metal) or hefty price tag, but if you need the capabilities of this lens it's simply the best.

While it is not a fuji prime in low light the lens stailization works on fuji cameras with or without in body IS works in lower light. Focus is good.Image quality is 95% of fuji more expensive lenses for half the price. For me excellent close focus, nice background blur, is handy in dense woods.

I just bought a new Fuji camera with lens. I now have protection for a very expensive zoom lens with a very inexpensive UV protection lens.Makes sense.

I purchased a Canon FD to Leica M adapter in order to get some more use out of my 17mm Canon lens. I’m pretty impressed with it so far. It seems considerably better quality than the cheap imported adapters, and not as expensive as a Novoflex. The lens hooks up solid and it feels solid on the camera body. I will most likely try some of their other adapters as necessary.

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...

Using this on my Fuji XF 16mm lens - it works perfectly. So well in fact, that I went out and got the ND1000 as well. It feels premium in every way and comes in a nice b=metal case lined with fitted foam. It's double threaded and has nice action on the screwing and unscrewing process. I used this for long exposures in daylight and cutting glare (and even longer exposes) at night.

I like getting this fuji film instead of getting the individual ones.