I am going to start a series about camera, lenses and accesories that I own or have previously owned. I am going to start with the Sigma 18-125mm F3.5-5.6 DC.
This is a “DC” lens in Sigma’s own nomenclature. It means that that lens was designed for reduced frame digital SLR cameras like Canon 30D and 400D and all present Nikon digital SLR cameras. It produces an image circle which would only be big enough to fill a 1.5x or 1.6x cropped APS sized sensor. Therefore, it will not work on a 35mm film camera or a full frame digital SLR camera like the Canon 1Ds series.
I don’t own this lens anymore. I have moved on to other lenses subsequently, but I will write about my experience with this lens.
The build quality of this lens is fine for a budget lens and Sigma include a lens hood with all their lenses unlike Canon, which only include lens hood for their expensive “L” lenses.
The focus motor is not the ultrasonic type and there is no full time manual focus. Focusing speed is fast, but not really lightning fast like lenses with ultrasonic motors. The focus motor is also quite noisy. The focus ring also rotates during autofocus, which may not feel comfortable when it rubs against the fingers holding the lens.
I bought this lens to replaced the 18-50mm kit zoom lens that came with my first DSLR, the Canon 300D. I have done a lot of shooting with this lens with both the 300D and my Canon 20D. It was my”standard” zoom lens. The lens that I kept on my camera most of the time. From my personal experience, the optical quality of this lens was better than the Canon 18-55mm kit lens. The optical quality was reasonably good, but of course it was not great or outstanding like a Canon “L” lens. One would not expect a lens of this price and a relatively large zoom range to be outstanding in optical quality anyway. However, besides reasonably good optical quality, this lens also has a good and flexible zoom range and is quite cheap. It should make a good replacement for cheap kit lens like the one made by Canon. Of course, if you can afford to pay more and expect the best optical quality, then you should look elsewhere.
The following are some of the shots I have made with this lens.