Now with the 2x converter it becomes a 400mm with the same 50mm aperture. 400 / 50 = 8. So the f-stop is f8. From this we can deduce that when using a 2x teleconverter out actual f-stop is double the marked f-stop (e.g. f4.0=f8.0), or 2 stops.
Boris Liberman wrote:
Hi!
I really should be embarrassed to ask this,but i'm over 50 and i can claim the "senior moment" disorder now.lol
I am over 30, but I think I had my "ignorance moment" when I read your questions...
Does the 2x make the lens a 400 from a 200 AND the f stop from f4 to f 8????
I think that if converter looses half the light it means it is one stop which I suppose is f5.6 from f4 and not f8.
I wonder whether I have just irreparably damaged my reputation in the club... <VBG>
Boris
-- graywolf http://graywolfphoto.com
"You might as well accept people as they are, you are not going to be able to change them anyway."
