This a conversation a friend and I had recently........That's nice, but what is it?...It's a M4/3.....Yes, but what's that? All I could think of saying was...well it's mirror-less which makes it a lot smaller than a normal DSLR. His next question was....What's the M4/3's bit then? Stumped, at that instant I could not give him an answer, and that coming from someone that's been 'into' photograhy for more than 50 years is sad indeed. I have always been a little flummoxed by :43:, to my it has a mystique about it that other types of photography from way back, never had, and yes I've done all the reading. So........Your mission, Forum Member, is to come up with a succinct sentance that adaquately describes :43:, understandable to me and a non-photo type. Oh..BTW, I will not be fobbed off with links to other sites who do it better that you can Oh..BTW2, I have since taken a severe dive in my friends confidence as the all knowing photo expert.