We talked at length here about the shortening of effective focal length
in the internal focusing macros. I just had someone report that the
Sigma 180mm f/5.6 macro is actually 105mm at close focusing distance. It
is no wonder that manufacturers keep these specifications a dirty little
secret, since length is a prime determinant of retail price in macro
lenses.
So much for those of you who long for something in the Zuiko line-up
longer than the 135mm f/4.5 Macro. We probably have one of the longest
actual focal lengths at close-focus distances.
Gary Reese
Las Vegas, NV
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