Here's a guide to upgrade your camera kit with lenses and camera filters.
If you don't have very steady hands, it is advisable that you opt for lenses with built in optical image stabilisation. Nikon's Vibration Reduction (VR), Tamron’s Vibration Compensation (VC), Canon's Image Stabilisation (IS), and Sigma's Optical Stabilisation (OS) systems, promise to offer sharper images. This effectively means slight physical shakes are controlled and corrected within the lens itself. While adding such technology to the lens does make it expensive, you will find a noticeable difference when using high-zoom tele-lenses, or when taking low-light shots. On the other hand, it does make you a steady photographer and improves your breathing control, if you avoid picking one with stabilisation functions.
Those of you who want a lens that supports autofocus (AF) would require any of the above mentioned kind of lens brands. USM is canon's Ultrasonic Motor lens (Stepping Motor for new-gen lenses), SWM is Nikon's Silent Wave Motor lens (also known as Auto Focus - Silent Wave or AF-S), HSM is Sigma's Hyper-Sonic Motor, and USD is Tamaron's Ultrasonic Silent Drive (PZD – Piezo Drive for non-ring type ultrasonic motors). So basically if your lens has any of the acronyms, depending on its brand obviously, you know that it supports autofocus.
Shopping for a DSLR filters and Lenses is a heavy task. Would you rather opt for a built in optical image stabilization lense or would you simply just want a lens that supports auto focus? The world of lense is large and knowing which one you need, triumphs over the one you want.