regards, Alan Chan
Some weeks ago I inquired here about the FA 24-90 lens quality. Subsequently I
bought the lens and shot some film with it. I would rate the optical quality as
very reasonable and the mechanical quality as not-so-good.
What puzzled me was the fact that when looking through the viewfinder the lens
in the longest '90' mm position still had a shorter (!) focal lenth than my M
2,0/85. I tried to verify this by mounting the remnants of an old ME Super
K-mount to the lens standard of a view camera and attaching the lens to it. As
the difference in distance between lens and film (when moving the lens from
infinity to 1:1 magnification) equals the focal length, I was able to measure
this with some precision.
The longest focal length turned out to be 81 mm (I'd say plus or minus 1 mm).
I have also tested some other Pentax lenses: M 2,0/35: 34,8 mm M 1,4/50: 49,2 mm M 2,0/85: 83,9 mm M 2,8-4/40-80 at 80 mm: 78,9 mm and found these are quite close to what the lens designation says.
Pentax Germany did not dispute my measurements but admitted that the 90 mm
designation is an exaggeration for competitive reasons (...everybody does it
like that).
So, effectively, this lens is an 24-80.
I thought you might be interested.
Sven
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