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 initial focus has been made, adjustments aren't too slow unless changing to a subject substantially nearer or farther away. HOWEVER, the AF engine did make a number of "mistakes" when using this lens that it did not using the IS lens (or, of course, the L-series glass); more than once I had to either switch to manual focus or try multiple times to get the right focus "lock." Furthermore, the USM model doesn't get you internal focus, either, like with higher-end lenses, so the end still rotates during focusing, which can be problematic with a circular polarizer or other filters.
Overall, I'd say that you "get what you pay for"; this is a very inexpensive lens, and it shows in some areas. But it's not nearly as bad as some would make it out to be. I tried it out both on several indoors shots under less-than-ideal lighting conditions and was pleased in most respects, and outdoors, I got very good results on even moving subjects.Canon 40mm EF f/2.8Nikon 24-70mm f/2.8G EDCanon EF 70-300mm f/4-5.6 IS Nikon D7000 Canon EF 85mm f/1.8 Nikon 50mm f/1.8D AF Canon EF 24-70mm f/2.8L II Canon EF 100mm f/2.8L IS Canon EF 16-35mm f/2.8L IIPanasonic LUMIX G 20mm f/1.7 Canon EF-S 10-22mm f/3.5-4.5 Nikon 18-300mm f/3.5-5.6G Nikon AF-S 50mm f/1.4G Nikon 28-300mm f/3.5-5.6G ED VR Nikon 18-200mm f/3.5-5.6G Canon EF 100-400mm f/4.5-5.6L IS Nikon 70-300mm f/4.5-5.6G ED IF Canon EF 24-105mm f/4 L IS Nikon 70-200mm f/2.8G ED VR II Canon EF 17-40mm f/4L
Rokinon FE8M-C 8mm F3.5Nikon 85mm f/1.8GPanasonic 45-200mm f/4.0-5.6 Canon EF 135mm f/2L Sony E 55-210mm F4.5-6.3 Canon EF 28mm f/1.8 Canon EF-S 15-85mm f/3.5-5.6 IS Canon EF 50mm f/1.2 L Canon EF 75-300mm f/4-5.6 Nikon 105mm f/2.8G Canon EF 70-200mm f/4 L IS Canon EF-S 18-200mm f/3.5-5.6 IS Canon EF 100mm f/2.8Canon EF 70-200mm f/2.8L Canon EF-S 17-55mm f/2.8 IS Canon EF 35mm f/1.4L Canon EF 70-200mm f/4L Nikon 14-24mm f/2.8G ED Canon EF 24-70mm f/2.8L Nikon 18-105mm f/3.5-5.6
Canon EF 85mm f1.2L IICanon EF 28-135mm f/3.5-5.6 IS Panasonic Lumix G Micro 4/3 Tamron AF 28-75mm f/2.8 SP XR Di LD Fujifilm Lens X-Pro1 35mm F1.4 Nikon 10-24mm f/3.5-4.5G EDCanon EF-S 60mm f/2.8Tamron AF 18-270mm f/3.5-6.3 Di II VC Canon EF 35mm f/2 Rokinon 85M-C 85mm F1.4 Tokina 11-16mm f/2.8 AT-X116 Sony SEL16F28 16mm f/2.8Canon EF 70-300mm f/4-5.6L IS Canon EF 2.0XNikon 40mm f/2.8GPanasonic H-HS12035Canon EF 24-105mm f/4 L IS Tamron SP 24-70mm Di VC Olympus M. Zuiko Nikon 70-300mm f/4-5.6G AF
Nikon 50mm f/1.4D AFSigma 10-20mm f/4-5.6 EX DC Sony Carl ZeissSigma 30mm F2.8 EX Sigma 70-300mm f/4-5.6 Sigma 10-20mm f/4-5.6 EX DCCanon EF-S 18-135mm f/3.5-5.6 IS Nikon 85mm f/1.4G Canon EF 24-105mm f/4L IS Tamron AF 17-50mm F/2.8 XR Canon EF 50mm f/2.5 Nikon 24-120mm f/4G ED VR Nikon 16-85mm f/3.5-5.6GCanon EF 8-15mm f/4LTamron AF 18-270mm f/3.5-6.3 Di II VC Tokina 11-16mm f/2.8 Olympus M.ZUIKO DIGITAL ED 75mm f1.8 Rokinon 8mm Sony 50mm f/1.8 Sigma 18-250mm f3.5-6.3 DC
Nikon 17-55mm f/2.8GCanon EF 24mm f/1.4L IITamron AF 18-200mm f/3.5-6.3 XR Di II LDPanasonic H-HS35100 35-100mm Tamron AF 70-300mm f/4.0-5.6 Di LDSony 75-300mm f/4.5-5.6Canon EF 1.4X Canon EF-S 18-135mm f/3.5-5.6 ISNikon 16-35mm f/4G ED VR II Sigma 50mm f/1.4 EX DG Panasonic Lumix 100-300mm f/4.0-5.6 G Nikon 24-85mm f/3.5-4.5G ED VR Nikon 70-200 f/4G ED VR Sigma 30mm f/1.4 EX DC Sigma 70-300mm f/4-5.6 DG Canon EF 400mm f/5.6L Rokinon FE14M-C 14mm F2.8 Tamron AF 18-200mm f/3.5-6.3 XR Di II LD Sony 50mm f/1.8 Nikon TC-20E
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