@RobertTheFat wrote:
Here's one point on which we can possibly all agree:
Suppose we define "a" as the amount of incident light falling on an APS-C sensor. Assuming a constant aperture and strength of the light source, the amount of incident light falling on a full-frame sensor is 1.6a, because its surface area is 1.6 times as great. If one insists on expressing that difference in "stops", it's a lot closer to a half stop (1.414a) than it is to a full stop (2a). FWIW.
No it is slightly more than 1 full stop, for the same reason a 1.4X TC is one stop and a 2X TC is 2 stops.
It is actually 1.6 squared times a. The 1.6X applies to the length and the width, not just the area. So it is (2.56a) a full stop+.
