The idea of a mirrorless interchangeable lens camera had been circulating for many years before Panasonic and Olympus announced the Micro Four Thirds camera system in August 2008, so it's not surprising that they didn't have the market to themselves for very long. Back when there was still only one Micro Four Thirds camera on the market, electronics giant Samsung showed a prototype of what was to be the first mirrorless interchangeable camera with an APS-C sized sensor. Ten months later that prototype has evolved into a finished product in the form of the NX10. While other large manufacturers are starting to talk about launching mirrorless systems, Samsung has become the third manufacturer to actually to turn talk into tangible product. However, while Samsung is only the third party to enter the fray, enough time has passed for the other mirrorless makers to have moved on to their second-generation of cameras, including the newly-launched Panasonic G2 and G10. Between them these two cameras (which like the NX take many of their styling ideas from DSLR designs) are likely to make life pretty difficult for the Samsung. The G10 doesn't match the NX's spec but is aggressively priced while the G2 offers smarter video compression and touch-screen cleverness, which will be attractive to some. And they have the advantage of being second-generation products, with the enhanced level of refinement that this tends to bring. The big distinction is that Samsung has decided to use the larger APS-C sensor of the type that is the de facto standard size in DSLRs. This offers the potential of good low-light performance (its sensor has a 50% greater surface area than those used in Micro Four Thirds and that means more light for any given exposure) but the lenses are not likely to be smaller than those used on DSLRs.