No it's not especially if you take into account its intended users. If you use a Canon digital SLR and are satisfied with the kit lens (18-55) then buying this lens can be the perfect next step for you. Practically speaking, you will be able to increase your zoom reach to the point where you can A) photograph birds in moderately distant trees, B) be able to zoom in on the other side of a valley and frame something of your interest. Those are just two examples. One thing you will NOT be able to do effectively with this lens, however, is to take sport shots with it. How so? Consider some of the following weakness:*At 300mm zoom range the highest aperture is limited to 5.6 (You will have to use very slow shutter speed to snap fast action shots; remember the inverse relation between aperture and shutter speed.)*The lens size/weight combination makes it hard to hold steady when attached to a camera like the Rebel XT*Slow and often inaccurate auto focus…

After reading several online reviews of the Canon EF 75-300mm f/4-5.6 III USM lens, I had nearly talked myself out of even looking at one. However, thanks to a local Canon demonstration, I was able to play with several lenses, the 75-300mm f/4-5.6 among them. I got to try it out alongside the IS version (which costs just under 3x as much), the non-USM version, and some of their L-series professional lenses.That said, I found there to be less difference among the directly-comparable lenses (the non-USM, USM, and IS versions) than I'd have thought. On the test shots I took using a Canon Digital Rebel XT, I didn't find full-zoom telephoto shots to be appreciably softer in the non-IS version reviewed herein, nor were the images overly soft for my liking period.The USM focusing didn't seem to make as much of a difference as I'd expected over the non-USM model, either. Focusing was still relatively slow (as other reviewers have pointed out), although once an…

If you're looking at this lens, you're more demanding than the average Joe who takes photos and have high expectations. This lens is not blazingly fast (f/5.6 at 300mm), and to reliably freeze camera shake, you're going to need a 1/500 sec shutter speed, which means that with ISO 100 film, you only can lose one stop of illumination under "Sunny 16" conditions before you have to decide comprimise somewhere to get your shot.Consequently, shots into the shade, or conducted under the warmer and softer lighting conditions of the morning/evening will inevitably drive you to the comprimise of a high ISO grainy film or the bulk of a tripod to make up for this lens's lack of optical speed. If you always shoot in full noon sunshine, you'll be okay.Even though its a great tool, most people don't like to carry a tripod, so the solution is to either accept grain in enlargements, not take certain photos, spend more money to go to a faster lens, or some combination of the above. I'll…