The Sigma 18-200 is a high zoom ratio lens that was designed for the APS-C digital SLR cameras. It is capable for covering different types of focal lengths. The lens comes with two SLD glass elements and two aspherical lenses that will offer corrections to a variety of aberrations. This also allows this lens to be housed in a compact and lightweight construction measuring only 70mm in diameter, 78.1mm in length and 405g in weight.
Similar to other lenses from sigma, the Sigma 18-200 comes with the new lens coating that reduces ghosting and flare - one of the problems that are popular in digital cameras. The coating will also create the best color balance. The maximum magnification of the lens is 1:4:4 while the minimum focusing distance is 45cm at all focal lengths.
The Sigma 18-200 design also features an inner focusing system, which limits the rotation of the front lens. This makes the product the best when it comes to using the petal-shaped lens hoods and polarizing filters. The overall lens' length does not change when the users are focusing, making it convenient to handle and easy to use. The users will not have any problems with zoom creep when transporting or traveling thanks to the zoom lock switch.
Similar to other lenses from sigma, the Sigma 18-200 comes with the new lens coating that reduces ghosting and flare - one of the problems that are popular in digital cameras. The coating will also create the best color balance. The maximum magnification of the lens is 1:4:4 while the minimum focusing distance is 45cm at all focal lengths.
The Sigma 18-200 design also features an inner focusing system, which limits the rotation of the front lens. This makes the product the best when it comes to using the petal-shaped lens hoods and polarizing filters. The overall lens' length does not change when the users are focusing, making it convenient to handle and easy to use. The users will not have any problems with zoom creep when transporting or traveling thanks to the zoom lock switch.
As the users enjoy the benefits of the Sigma 18-200, they need to know that the autofocus is a little noisy and slower as compared to other alternatives. They will also have to make do with the loss of optical quality towards the telephoto ends. However, with it, they will not have to worry about carrying a lot of lenses for changing because the Sigma 18-200 will cater for all their needs.
They will also encounter one problem with chromatic aberration though. The feature is well controlled at the wide end, but when the users increase the focal length, it starts to suffer. The same applies with distortion, which is neutral at the wide ages but becomes a little bit noticeable at the extreme long end. The advantage is that with the Sigma 18-200, they will enjoy a good contrast.
This product comes with a high zoom ratio of 11 times, but as I said previously it is compact and lightweight, making it easy to carry. The users will enjoy versatility and convenience that allows them to capture wide angle photos and portraits without any problems. The compact design of the Sigma 18-200 also makes it a great option for many users because it is easy to handle and use.
|