I was wondering what is the angle of view or the equivalent focal length of an half-frame Pen F lens when adapted on a m43 camera. This page on wikipedia: http://en.wikipedia.org/wiki/Olympus_Pen_F has a 35mm equivalent column that is not twice the focal length. The "half-frame" was 24x18 while the m43 is 18x13.5. So a 100mm will behave as a 140? Or a 200? Or a 280? Or something else completely? I would expect a "conversion number" smaller than 2.