There is an underlying desire in every travel or street photographer to be able to carry one lens to cover all contingencies.

A one-lens solution like this 18-250mm Sigma optic is a very popular option with photographers, because you only need to attach the one lens to your camera and you can enjoy a whole range of shooting options.

Sigma's new 18-250mm f/3.5-6.3 DC OS HSM is designed as an all-in-one lens for digital photographers with APS-C-sized (DX) sensors who don't want to carry more than one lens. Covering focal lengths ranging from the 35mm equivalent of 27mm to 375mm with most camera brands (28.8mm to 400mm on Canon...

The barrel has a large zoom ring and a small manual-focusing ring at the front, with a zoom scale marked at 18, 24, 28, 35, 50, 80, 135, and 250mm. The three switches on the barrel include Zoom Lock, AF/MF, and stabilization ON/OFF.