On Thu, Jun 15, 2000 at 11:10:58AM -0700, Lex Jenkins wrote:
> Frieder Faig offers helpfully:
> >Easy to find out. For 1:1 magnification a lens mus be elongated for it`s
uups, typo: mus -> must
> >focal length. Take a ruler and meassure the lenght of the lens when
> >focused to 1:1-magnification, and subtract the lenght when focused to
> >infinity. If it matches the focal length, it loses 2-f-Stops. If it is the
> >same (IF-lens), it loses half of effective focal lengh. If it is in
> >between, It losses an (smaller) amount of both.<
>
> Ah, OK, I got it. I think.
>
> Mmm... could you repeat part of that... the part starting with "Easy to find
> out."
Maybe I should be more careful when translating into English ..... :-|.
I tried to explain: When a (konventioel e.g. Zuiko-80 f/4 Makro) lens is
adjusted to shoot
1:1 -magnification, the amount of the elongation of the barrel, compared to
infnity-lenght,
is exact the focal length.
Frieder Faig
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