So how are folks coming up with the f/3.2 equivalent? If the Nikon 1 is a 4/3 system, then you double the aperture, correct? That being the case, if you do the math the correct way, you square the aperture of f/1.2 and get 1.44, then multiple that by a factor of 4 (2 square) and get 5.76, then take the square root of that and get f/2.4.
This fits because f/1.2 is half way between f/1 and f/1.4, f/1.7 is one stop slower, being half way between f/1.4 and f/2, then f/2.4 is half way between f/2 and f/2.8.
So how are folks coming up with a f/3.2?
I LOVE this app, I have started a photo series using this app called "My World". I post directly from my phone to my web site. Here is the gallery: