On Mon, 11 Jan 1999 MorrisMini@xxxxxxx wrote:
> How is the focal length calculated? Do you add the converters and then
> multiply times the lens length, or multiply one converter times the lens
> length and that times the other converter? For a 300mm, for example, is it:
>
> 300mm X 1.4 = 420mm
> 420mm X 2 + 840mm
>
> -or-
>
> 300mm X (1.4 + 2)= 1020mm?????
I wonder how you came up with the idea of "adding" the facors of
"multipliers".
They are multipliers, so you multiply all the time. (Himm.. Since 2+2 =
2*2, it might have caused some misconception).
Wishing you a VERY ROBUST tripod for that,
OMer
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