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Rating: 
Summary: My everyday lens from now on.
Review: I bought the Sigma 28-135mm 3.8 - 5.6 to replace my broken Canon 28-70 3.5 - 4.5. The Sigma is nearly as fast, but offers a much greater range of focal lengths - the 70-135 range that was NOT on my Canon makes the lens far more versatile. Furthermore, the Sigma offers a very effective macro range (at the 135mm focal length only). Even when not in the macro mode (which requires throwing a switch) the lens focuses very close (to about 20").Like the Sigma 70-210mm, the 28-135 has a little difficulty focusing in low light settings (more so than did my Canon 28-70). However, in good lighting conditions it focuses very quickly. Photos appear sharp from edge to edge, at all focal lengths. Zooming is smooth, and I have noticed no "creep." The lens comes with Sigma's specially-shaped hood, designed so as not to interfere with wide-angle shots. The hood makes it very difficult to put on and take off the lens cap (so far the only negative thing I have to say about the lens). For what it offers - a great range of focal lengths and good macro at a reasonable price - this is a fabulous lens. It gets 4 stars instead of 5 because of its 3.8 aperture - a 2.8 would be nicer, but probably far more expensive. (And yes, I'm aware of the Sigma 28-105mm 2.8-3.?, but its reviewers have questioned its sharpness). Get this lens and it will probably stay on your camera all the time. Mine will.
Rating:
Summary: My everyday lens from now on.
Review: I bought the Sigma 28-135mm 3.8 - 5.6 to replace my broken Canon 28-70 3.5 - 4.5. The Sigma is nearly as fast, but offers a much greater range of focal lengths - the 70-135 range that was NOT on my Canon makes the lens far more versatile. Furthermore, the Sigma offers a very effective macro range (at the 135mm focal length only). Even when not in the macro mode (which requires throwing a switch) the lens focuses very close (to about 20"). Like the Sigma 70-210mm, the 28-135 has a little difficulty focusing in low light settings (more so than did my Canon 28-70). However, in good lighting conditions it focuses very quickly. Photos appear sharp from edge to edge, at all focal lengths. Zooming is smooth, and I have noticed no "creep." The lens comes with Sigma's specially-shaped hood, designed so as not to interfere with wide-angle shots. The hood makes it very difficult to put on and take off the lens cap (so far the only negative thing I have to say about the lens). For what it offers - a great range of focal lengths and good macro at a reasonable price - this is a fabulous lens. It gets 4 stars instead of 5 because of its 3.8 aperture - a 2.8 would be nicer, but probably far more expensive. (And yes, I'm aware of the Sigma 28-105mm 2.8-3.?, but its reviewers have questioned its sharpness). Get this lens and it will probably stay on your camera all the time. Mine will.
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