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'm a professional videographer and I bought this filter for my Canon 24-105 F4 L lens. I have to say that I'm VERY impressed with the construction and performance of this filter. It's wonderful to now be able to shoot live video, outside in the desert, at F8 instead of F22. It also seems that the image quality is modestly improved. Thank you!Robert Marcos

you get what you paid for. It's not a product like B&W.Wonderful for sony zeiss 55 1.8. I touched the glassed in the lens and made some scratch and then decide to get this one. This filter can really protect the lens from unintentional touch.

　EOS 1DXに24-70mm F4 ISを装着（フード逆付）し、仕切りでもう一部屋作ったところに16-35mm F4 IS、さらに上部の小物入れにSPEEDLIGHT 430EXⅡ、予備バッテリーが何とか入りました。　何とか入ったというのは、ボディの頭が出っ張り少し膨らんでしまうこと、ボディをバッグ内で固定するために仕切りクッションで開口部上部を塞ぐことになってしまい、スリングバッグの特性である肩からクルッとまわしてカメラを取り出すということが出来ないというところです。　到着したばかりなのでもっと良いやり方があるのかもしれませんが、とりあえずフルサイズ+縦グリ+標準・広角レンズ装着でも入れることは出来るという報告です。　あと、当方胸囲105cmですが、ベルトを目いっぱい伸ばしてギリギリ背負える感じでしたので、上着を着ると窮屈かもしれません。