| The Sigma 18-50mm f/2.8 lens is an autofocus | | | | and zoom ring, both of which rotate smoothly. |
| lens optimized for digital Cameras and provides an | | | | The Lens takes a 67mm filter size. |
| extremely useful range that is the 35mm | | | | The focusing speed is good. Although not blindingly |
| equivalent of 28mm to 80mm. With a constant | | | | fast, it is quite reasonable in low light as well as |
| f2.8 maximum aperture, this lens is very useful | | | | bright light. The lens motor is very quiet as it |
| and performs with the best of the best. While it is | | | | incorporates the sigma HSM motor technology. |
| very comparable to some of the best lenses it is | | | | The image quality of the lens would rank |
| slightly edged by those that cost 5 to 6 times the | | | | "very-good to Excellent. In using the lens I have |
| price. This lens comes in various forms fitting both | | | | noticed very minimal chromatic aberration and little |
| Canon and Nikon. | | | | to no barrel distortion; only noticeable around the |
| The Sigma lens is particularly appealing not only | | | | 18mm wider side. |
| for its large constant aperture, but also for its | | | | Performance of the lens at its widest aperture of |
| very compact, size. The lens is 3.3 inches long and | | | | f/ 2.8 is pretty good with only slight softness in |
| weighs 15.6 ounces. The lens feels like it's just the | | | | the corners and very sharps in the center. |
| right size and weight on my Nikon D300. | | | | Reducing the F stop to f/4 gives a little more |
| The Sigma 18-50 comes packaged with a | | | | room in the depth of field and results in a very |
| petal-shaped lens hood and a soft lens case that | | | | sharp image. I personally feel the lens does it best |
| can attach to most camera bags or even you | | | | at f/5.6. Of course at f/8 the lens is tack sharp |
| belt. While the 18-50 lens is made of a fairly | | | | but will hinder low light photographs. |
| attractive plastic which has a velvety matte | | | | I would highly recommend this lens as it is well |
| appearance, it is very durable and can take a | | | | made and is a solid build. The lens is very sharp |
| beating. The lens not only looks classy, it feels like | | | | and has the ability to produce wonderful images. |
| a well constructed solidly built lens. A nice feature | | | | The lens does come in both a HSM and a |
| the lens incorporates is a lock switch that | | | | NON-HSM build. If you have a Nikon DSLR without |
| prevents the lens from extending, which is very | | | | the motor built in such as the D40, D60, D3000, |
| convenient when you are carrying the lens around | | | | D5000, you will want to make sure you get the |
| on your camera. The lens has a manual focus ring | | | | HSM version as it will not autofocus otherwise. |