Rating: 
Summary: Tough for sports
Review: An OK lens for shooting fixed objects and panoramas, but the autofocus is frustratingly slow and almost impossible to use on moving subjects. Limited utility of this lens may explain why it is now often found at fire sale prices.
Rating: 
Summary: Excellent Introduction to the long range zoom world.
Review: Bought this lens for my Canon 300D. I chose to buy it despite a lot of mixed reviews. I love the lens. Great focus throughout the range. Have been using it almost 4 weeks now. It is hard to hand hold at 200-300mm, but I knew that when I bought it, thats why I use a tripod or monopod.If you want 75-300mm and can't afford the IS $400 version, this is definately a good bet. I'd buy Canon glass anyday over tamron/sigma/quantaray.
Rating:
Summary: Canon's EF 75-300mm f/4-5.6 III USM...
Review: Canon EF Lenses Have A Built In AF Motor..Compared To Camera Body-Based AF Motors, Lens-Based Motors Have Driving Energy With Lower Transmission Loss...The AF Operation Is Therefore Quick, Quiet, And Highly Precise...All EF Lenses Also Have EMD (Electromagnetic Diaphragm) To Control The Aperture Electronically...The Aperture Can Be Set Either With An Electronic Dial Or With The Electronic Pulse Signal Sent According To The Exposure Reading...The Aperture Control Is Therefore Precise And Umnatched... To Go With Canon's Reputation, They Introduce A Lens That Is Truely Immaculate...Its Telephoto Zoom From 75mm-300mm Is A Great Addition To A Current Setup With A 28-80mm Lens And Is Ideal For Shooting Sports, Wildlife, Or Portraits...It Can Compress An Image To Give Dramatic Effects...The Optics And Construction Are Compact And Lightweight (Compared To My Nikon FM Setup) And The 4x Zoom Is Great...A Very Steady Shot Even At Maximum Zoom...The Apature Stops Are Adaquate, Being f4-f5.6, But Could Be Wider...All In All An Awesome Lens For The Money...Another Canon Hit... The Lens Is The Same As The EF 75-300mm f/4-5.6 III, However It Uses A USM To Drive The Autofocus Rather Than A DC Motor... *Specs Taken From Canon's Catalogue...
Rating:
Summary: good lens for the price but lacks advance features
Review: Given the price alone, this lens deserves 4 stars because it does a fairly good enough job, considering other three Canon lenses in the 70-300mm category are priced from $400 to $1,000 to $2,000 dollars. With that said, this lens does lack one necessary advance feature in order to accommdate the 300mm range shots. When shooting in telephoto range, this lens' lack of image stabilization (IS) becomes hugely apparent, and in many instances makes handheld shots difficult to control and stabilize. Consider purchasing a sturdy tripod should solve this issue. This option still costs less than buying the next higher up $400 lens alone. In addition, this lens' autofocus USM isn't quite up to speed. There are too many occurrences where this lens just can't get in focus even when I pointed my Canon 10D camera's focus right between two high-contrast objects with a vivid center line in between. Overall, if you are a beginner with low budget, this cheap lens will offer you ways to learn the obstacles of photography and to be creative and discipline in your approach. If you have the budget, go for the higher, more advanced models and save yourself the hassle of accomodating your shots for the lack of important features and keep your focus on taking beautiful pictures.
Rating:
Summary: Useful zoom lens
Review: Here is a zoom lens that produces good photos, but not as good as I get with my Canon 28-105 mm lens. I am overall satisfied with it and USM is a definite plus. However, do not expect astonishingly clear pictures from this lens! And you really have to use a tripod to get the most out of it. I do not carry this lens out most of the time in the camera bag because it is rather heavy. Buy it only if you need the zoom. I have experienced no mechanical or optical problems with this lens and therefore quite satisfied.
Rating:
Summary: Useful zoom lens
Review: Here is a zoom lens that produces good photos, but not as good as I get with my Canon 28-105 mm lens. I am overall satisfied with it and USM is a definite plus. However, do not expect astonishingly clear pictures from this lens! And you really have to use a tripod to get the most out of it. I do not carry this lens out most of the time in the camera bag because it is rather heavy. Buy it only if you need the zoom. I have experienced no mechanical or optical problems with this lens and therefore quite satisfied.
Rating: 
Summary: Great value
Review: I bought this lens when I was going to take the kids to the zoo one day. My camera shop was kind enough to remind me I could return it if I were not happy with it. I kept it and have used it several other times with great results on my Digital Rebel. Other than agreeing that there seems to some soft focus if you hit the 300 stop point, the performance of this lens has been a very pleasant surprise - especially when you factor in the price. This is a real lens with a metal lens mount and a fast USM motor that makes focusing instantaneous. I have also found it to be no problem hand holding this lens despite the higher effective focal length since it is mounted on a digital.
Rating:
Summary: Great value
Review: I bought this lens when I was going to take the kids to the zoo one day. My camera shop was kind enough to remind me I could return it if I were not happy with it. I kept it and have used it several other times with great results on my Digital Rebel. Other than agreeing that there seems to some soft focus if you hit the 300 stop point, the performance of this lens has been a very pleasant surprise - especially when you factor in the price. This is a real lens with a metal lens mount and a fast USM motor that makes focusing instantaneous. I have also found it to be no problem hand holding this lens despite the higher effective focal length since it is mounted on a digital.
Rating: 
Summary: Rotating Front Element
Review: I had this lens a few years back, but upgraded to the 100-300/4.5-5.5. This lens does not have the Canon ring based USM, so there is no Full Time Manual (FTM). You have to switch it to manual. The 100-300 has FTM.
But, the biggest problem with this lens, is that the front element rotates. This is particularly problematic with filters such as circular polarizers or star filters. Just as you have it set, the focus moves slightly, and bang, you now have to fiddle with your filters again. The 100-300 has rear focusing, so it does not suffer from this problem.
Currently, I am looking at upgrading to a 70-200/4L. Get even better glass. And moving from 35mm to digital. But I will not get the "kit" lens with the reb or 20d. Why? The 18-55s front element rotates. I point this out just to drive home the point. Front element rotation is horrible.
Otherwise, the lens is a good value. I sold mine to my sister in law, who never uses filters. It focuses quickly, and is quiet. The optics are on par or better than you would expect from a $175 lens.
Rating:
Summary: great lens with few problems
Review: I upgraded from a 80-200 to this lens and have really appreciated the extra range. Sure this isn't a professional lens, but for us advanced amateurs it offers all the versatility at a very affordable price. My only problems with this lens is that focus tends to be slow and the barrel is a little stiff. I'd still highly recommend it though.
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