At 1:1 magnification, the F/FA100/f2.8 as well as the new DFA100/f2.8
all are near 75mm lenses. You can see that from the working distance
which, at 1:1, is roughly four times the focal length. For the
FA/F100/f2.8, at 1:1, the working distance is 310 millimters, thus the
focal length at 1:1 is near 310mm/4=77,5mm. For the DFA100/f2.8, at 1:1,
the working distance is 300 millimters, thus the focal length at 1:1 is
near 300mm/4=75mm. The focal length of all these lenses varies due to
the FREE (fixed rear element extension) design.
Arnold
J. C. O'Connell schrieb:
If I had to go with only one macro lens it would be about a 75mm but nobody makes one! I do use
75mm/80mm macro lenses on a bellows but with a bellows the maximum focus distance is very limited and often too close.
JCO
