"Samsung includes a pretty standard 18 - 55 lens with the GX-1S. This lens has a field-of-view equivalent to 27 - 82.5 mm on the camera. The same lens is sold under different names by Pentax and Samsung: Pentax puts their name on it, while Samsung puts the Schneider-Kreuznach label on it, which should tell why I'm always skeptical about the famous German names on digital camera lenses these days. Anyhow, the GX-1S works both of the Samsung lenses on the market (the kit lens plus a 50-200 mm model) and most modern Pentax lenses as well.
The GX-1S is one of a select few D-SLRs that uses AA batteries. In fact, it uses four of them, and Samsung puts alkaline batteries in the box with the camera. Those won't last forever, so do yourself a favor and get a set or two of NiMH rechargeables (2300 mAh or higher) plus a fast charger. The camera can also use (non-rechargeable) CR-V3 lithium batteries." Read this nice review here: