Below is a complete list of NX mount lenses.Recommended Lenses:NX1: The 16-50 f2.-f2.8 is a fantastic lens, it may look expensive, costing nearly the same as the NX body itself but he quality of this lens blew me away and I strongly recommend buying this "kit" lens with the NX1. The one real drawback to the lens is the weight - it isn't light so the little 20mm or 30mm prime lenses are excellent when you want to travel light.16mm f2 - that's FAST. Stays at f2 till 20mm where it hits 2.2. At 24mm f2.5 and at 33mm f2.8NX500: While you can use the 16-50 f/2-f/2.8 with the NX500 it creates a more unbalanced user experience and defeats  the point of buying a small camera like the NX500. I recommend going with the 16-50 kit lens that comes with the NX500 and also picking up one of the prime lenses like the 20 or 30. These give you better quality, better low light performance and do it in a small and compact form factor. 

 Adapters:Fotodiox makes an NX to EF mount adapter that I discuss in my NX review. At this time I cannot recommend it unless you are deserparet to mount EF lenses on your NX. It is a dumb adapter, meaning you will lose aperture control(the lens will be at its widest aperture), manual focus and no image stabilization(if the lens offered it) - Check out the Fotodiox Adapter on B&H PHoto Third Party Lenses for NX mount cameras:Bower, Samyang and Rokinon offer excellent manual focus and manual aperture lenses for the NX system - perfect for video where you will not need to use the NX autofocus system.See the complete list at B&H Photo