Difference between NEX-5R & NEX-5RK
Sony NEX 5R is the name of the body/model. Sony offers this machine with various kit lenses. So, NEX 5RK means that you will get this body with the SEL1855 lens (18-55 cm cca 6 cm lens). NEX 5RL means you get it with the SEL1650 lens (16-50 cm cca 3 cm pancake, but without zoom ring = electronic zoom). Then some shops add third character to define the color (5RKB means black color of body.. questionable what's the color of lens then.. - therefore I bought the silver color what was the cheapest version matching the silver color of lens. For more product codes, check official Sony webpage..