This head is rock solid! It holds my 5D Mark iii with a 24-70mm lens in portrait mode with no problems.

Pros:- Outstanding sharpness, saturation, and bokeh- USM AF is fast and quiet- 2 focus range settings- Fast f/2.8 throughout zoom range complements 24-70mm f/2.8L- Image Stabilizer- 2 IS modes: 1 - normal & 2 - panning- Weather sealed- Common 77mm filter among L-series- Front element does not rotate with focus- Non-existent zoom-creep (lens does not extend)- Solid construction and feel- Focus range indicator window on top of lens- Comes bundled with lens hood, tripod collar ring, and standalone lens bag- Well controlled vignettingCons:- Heavy- Expensive- Longest of the 4 Canon 70-200mm'sThoughts:Outstanding Lens! Always use a filter and use the lens hood as much as possible. The lens hood does get in the way of using a polarizing filter since the front element does not extend. Front element does not rotate when focusing. One of my more favorite lenses. It is used in conjunction to my 24-70mm f/2.8L. My 1.4x extender is only used when I want more reach, but it does cut the sharpness down a bit. I love the IS on here. The ability to change IS modes is awesome. Having 4 setting switches on the lens is a step up from the 24-70mm f/2.8L (that having none). The white finish on this lens garners a lot of onlooker attention. You'll get a ton of attention at events and need a monopod if you want to use it for a baseball game and the like. 24-70mm f/2.8L seems light after wielding this lens. This lens attached to a 40D will not fit the Lowepro Slingshot 200 in the quick draw position. That said, I never use the included standalone lens bag (it looks more like a tan & black lens holster; comes with a thin black shoulder strap). It's best to get this on sale (Christmas season comes to mind). The $1700~ price tag is steep, but the $200~ in instant rebate is nice.Bottom line:Outstanding Lens! Highly regarded and recommended.

Hoya HMC UV was my secondary UV filter. I have a B+W UV filter for my 24-70mm L Lens, but I wanted one for my Tokina 11-16mm wide. I didn't want to spend as much money as I spent for my B+W, so I gambled and took a chance with this one. Honestly, I don't see a difference in quality of my images. Perhaps there might be some if I really look into and compare, but overall, this one performs well.I also chose this one over the other filters because it was the slim frame one. I read that the normal ones might be too thick for a wide angle and you'll notice it in your shots.

Fits perfect on my 70-200mm 2.8 L lens and 24-70mm 2.8 L lens.

Originally bought this lens cap for a 70-200mm lens. It fit the lens perfectly; however, it was a very tight fit putting the lens into it's case. My 24-70mm lens did not have a lens cap and it took the same diameter as the 70-200mm. So, I ordered a side pinch cap (which is thinner) for the 70-200mm and used this one on the 24-70mm. Worked out perfectly. Would definitely recommend purchasing a side pinch cap for 70-200mm lens if you want to put the lens into the case that usually comes with it.

I use it with my 15mm fisheye f2.8 (mostly), but also with my 50mm f1.4. I did try 24-70mm and also 70-200mm and its good also, but the look of the gear was weird and funny. But the lenses worked very well :)

This just barely fits my Nikon D750 with the 24-120mm f/4 ED VR lens attached. Because the top flap isn't quite wide enough, the rear top corners of the camera body aren't very well protected (four stars). Other than that, the BodyBag seems to provide significant protection from getting the camera/lens bumped around and from getting wet.

This filter works great. I have used this filter on a Nikon 18-70mm lens and have produced excellent pictures. I have yet to experience any flare with this polarizer. Great polarizer for a great price.