Frieder Faig offers helpfully:
Easy to find out. For 1:1 magnification a lens mus be elongated for it`s
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."
Lex ;)
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