In a genuinely unscientific and amateurish experiment, I just put my 35-105 on
an OM-4 and stepped outside. With the aperture set to f/11 and the lens
pointed at a uniformly sunlit wall, zooming from 35mm to 105mm resulted in a
two segment change in the LED meter reading.
Looks like it's not a constant aperture lens. I never really cared. Even
though I've got the 35-80/2.8 Zuiko and a 28-105/2.8 Tamron, I often still use
the 35-105. It's a really nice lens, whatever the aperture may actually be at
67mm.
Walt
>
> 151888 has the dot, located close to the f/5.6 mark when the lens is at full
> aperture, though (as with Walt's) I think it is open to question whether it
> is brown, orange, red...
>
> I was quoting from the instructions sheet (more or less), but to answer
> directly, yes there are multiple versions. I don't know if they have
> different aperture characteristics.
>
> Piers
>
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