Although this lens is considered as ultra wide lens, for XTis and 30D's, this is really a 28-65mm lens (not "ultra" but regular wide). I purchased this for about $700 at Amazon to replace the kit lens 18-55mm the XTi came with. I am very pleased with the photos that I am taking. The focus is quick. The images are sharp, and the color is beautiful. I like the lens a lot. Because it's a F4 lens, I do need to use the flash. With 430EX flash I am getting pleasing shots in low light situations as well. I suppose a lower F stop might be better but I don't think Canon makes a lower F stop lens of comparable build. I did consider 28-70mm F2.8L (45-112mm on the XTi), but then it's no longer a "wide" angle lens. Compensating for the crop factor, getting a wide angle lens meant 17mm or less. So, this was really the only choice I had for an L quality build at this price range. Over all, I am very satisfied with the build quality and the results. The 40mm (64mm on the XTi) is a bit short, and I wish it were longer. However, giiven that this lens costs only (did I say "only?" lol) about $650, I have no complaints about the lens. Something's gotta give. It's weight is nicely substantial (not too heavy), and since I use my XTi with a battery grip all of the time, the combined weight balances well in my hands. To me, the battery grip and this lens are perfect companions to make the XTi's complete. I like this 17-40mm f/4L USM Wide Angle Zoom Lens for my XTi.

I was unsure if this would fit the Sony FE 50mm F1.8 lens… fits perfectly and appears to be the exact same lens cap model that lens comes with!

I shoot with a Canon 20D and before purchasing this lens, used the Canon EF 75-300mm f/4.5-5.6 III USM lens. I've always noticed the limitations of this lens when shooting amateur softball. I reviewed the lens lineup at the Canon website and decided on purchasing the Canon EF 100-400mm f/4.5-5.6L USM Lens. The 100-400mm is a great lens, but it can be a little soft. For that reason I decided to add the Canon EF 70-200mm 2.8/f IS USM telephoto zoom lens to my lens collection.As an L lens, there are numerous features and is manufactured with high quality materials and a higher level of dust and moisture resistance compared to the standard line of lenses. This pro quality lens is meant for serious photographers with high demands of their equipment. The construction is sturdy and consists of 23 elements in 18 groups. The four Super UD-glass elements largely eliminate the secondary spectrum reducing residual chromatic aberration. An improved 8-blade circular aperture offers a more pleasing out-of-focus image. The Canon EF 70-200mm lens weighs in at about 3.24 lbs/1,470 g, and a minimal focusing distance of 4.3 ft/1.3 m. The front thread accepts 77mm filters, be sure to get a 

good quality UV haze filter









to protect the front lens element. This lens is compatible with the 

1.4x II









 and 

2X II









 telephoto extenders.Being white, this lens looks out of place, but helps it stay cool when shooting out in the sun. Some people are concerned that being white, it attracts attention to criminals. From my experience, my 20D attracts attention regardless of what lens I put on it. In addition, I most likely have a camera bag and tripod/monopod with me to further attract attention. I personally doubt a thief looking for something to steal is taking the time to evaluate the cost of the item and are more concerned with the ease of taking something they can unload. I try to make things difficult for would be thieves and have my equipment insured as a back up.The dual IS system has two modes. Mode 1 is for stationary subjects while mode two is for moving subjects. It is recommended that the IS function is not used while using a tripod; however I have successfully used this feature while on my monopod. The IS helps to eliminate camera shake and helps stabilize the lens when shooting from a moving vehicle or in low light situations. While there are limitations to what the IS can do, it can give you a few extra stops. Just keep in mind, the IS attempts to eliminate camera movement, not the movement of the subject being photographed.This lens permits for auto or manual focus depending on how the switch is set. There is also a switch to shift from a 1.4m/4.6ft to infinity or 2.5m/8.2ft to infinity.Included with this lens are the tripod mount, lens hood, and storage case. The tripod mount is the best option to use when mounting to a tripod, helping to maintain balance. Mounting the camera instead creates an unbalanced set up that may topple over. The case is a 

zippered soft case (LZ1324)









 that can also be purchased separately. The 

lens hood (ET-86)









 is used to reduce lens flare and can protect the front element in certain situations. Often times, Amazon recommends purchasing the lens case and hood, however they are normally included with the lens.The Canon EF 70-200mm is such an awesome lens, it almost fails to compare to the 

Canon EF 75-300mm f/4-5.6 III USM telephoto zoom









. The 

EF 100-400mm f4.5-5.6L IS USM telephoto zoom lens









 is a well used option for me, but the clarity and sharpness of the 70-200mm IS lens is more refined. I doubt the 100-400mm lens will be replaced by this lens as a favorite. I find the push/pull focusing of the 100-400mm lens to be a benefit that the 70-200mm cannot replace. This lens can be used for portraits, landscape, sports or as a general walk about lens. The f/2.8L combined with the IS makes this lens a good option for certain low light situations. The features add creative versatility. The Canon EF 70-200mm IS lens comes at a price, but it is worth every bit of it.PROS:Incredible clarity and sharpnessQuiet and quick auto-focusFeatures add creative versatilityDual IS systemCONS:Heavy and bulky (This should be expected with these types of lenses)

I bought a set for my RF 28-70mm lens which has 95mm size filter threads. I like to shoot while wearing tactical pants (better than cargo pants) and will swap or stack filters in and out easily with side pockets. Not as fast as internal ND but fast enough. These are better than using a variable ND because it doesn’t interfere with the circular polarizer. I exploded it my pants. So good. SOOOOOO GOOOOOD. Really.

Bought to fit my Canon zoom lens EF-S 18-55mm 1:3.5-5.6 IS lens that is 58mm total. Make sure to check the size of your lens (the single number with mm attached). Love how it stays securely in place, but easy it is to remove, when I find the perfect shot. Thanks a million!

I give this 3.5 stars. I use this with a number of Minolta MD's - 28 f/2.8, 28-85 f/3.5-4.5, 135 f/2.8 and 200 f/4. I've not noticed any light gap problem that I read about just now prior to writing this review. The only thing I find annoying is the infinity focus issue. I like to not spend much on these items but as I use more and more MD's it would be nice to have access to that very simple feature of manual focusing. Thus if not on a budget seek out an adapter that gives you infinity focus. Though I do have 4 lenses I use only one adapter, leave adapter on camera and just switch out lenses. Pic w/ MD 28 2.8.

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

Fits perfectly to my Tamron Aspherical 28-400mm lens