Can anyone tell me when a lens listed their angle of view at say 180 degrees, would that really be an effective 108 degrees or so with an APS sized censor? I know angle of view is a combination of format and focal length so I assume this would be the case but am not positive (as I don't own a full frame digital).
I'm assuming the lens is NOT made for 1.6x as I've never seen one of those listed with an angle of view of more than say 108 degrees or so.
thanks!