I had a bizzare thought the other day while playing around with macro "stuff". 1) macro (for m4/3) at 1:1 means you can fill your entire frame with something the size of a full frame sensor... like a full frame sensor. 2) macro 2:1 means you can fill the entire frame with something the size of a m4/3 sensor... 3) when I reverse my 17mm lens, I think I can do roughly 4:1, i.e. I can fill the entire frame with about 1.2 cm wide image. That had me thinking... if some one has something like a 4:1 (or even 2:1) macro (at say 12mp), and they took a picture of a full frame sensor (say 12 mp full frame sensor) That means at 100% crop we should get about 4 pixels representing each physical pixel on the full frame sensor. So... who's got a 2:1 or 4:1 macro and a spare full frame sensor lying around (or even just a spare low mp density sensor). Can some one actually take a picture of a sensor and see the physical pixels?