I may need a new lens. The Sigma17-70mm F2.8-4 DC Macro OS HSM

 

Offers Sigma’s OS System (Optical Stabilization) allowing handheld photography even in low-light situation.

Close focusing down to only 8.7” away for a 1:2.7 magnification which is approximately ½ life size.

Three aspherical & ELD glass elements provide critical sharpness & low distortion.

A Super Multi-Coating is used to reduce the occurrence of flare & ghosting and delivers high performance across the entire focusing range.

  

I now own the earlier, non-OS version of this lens and I love it! It is my "go-to" glass and is the lens that I use the most. I am very satisfied with the performance but would like to add image stabilization to the mix.

Sigma’s 17-70mm F2.8-4 DC Macro OS HSM is the practical zoom! A large-aperture, standard zoom lens for digital cameras with an open-aperture value of F2.8 (at 17mm) and covers the most frequently used focal lengths. With an aperture fast enough to be used in many light situations, its close focusing for use with very small object and its outstanding optical performance make this an ideal all-around lens for landscapes, portraits, still life studies, group shots and just about any everyday photo situation. The OS, Sigma’s anti shake feature, offers the use of shutter speeds approximately 4 stops slower than would otherwise be possible. The OS feature allows Sony and Pentax users the option of viewing a stabilized image in the viewfinder, a feature offered only by Sigma. HSM ensures quiet and high speed AF capability. With a faster aperture than the typical camera “kit lens” it is an excellent choice for the photographer who has higher expectations for their photo equipment.

 

As long as I own APS-C cameras I can not think of a better normal zoom to have mounted on them.