Leon,
My apologies for being too blunt with you, perhaps I should have been more observant..
Associated term "effective focal length" to "1.6 rule" is much worse actually.
I understand that the whole thing started by someone to help users of photo-equipment "visualizing" the effects of various FL's and sensor sizes combinations to FOV.. but the result of that "help" was just more confusion instead of proper education on how things work.. And that rattles me sometimes.. not as often recently as it used to in the past
