It's a triviality. What percentage of the surface area of that element
do you suppose is taken up by that dust spec. 1/100 of 1 percent?
1/1000 of 1 percent? The only thing the dust spec does is cause a tiny
amount of blocked light and a tiny amount of diffraction all based on
the area of the dust spec and the linear length of its edges. Now
compare that to the 30 or 40% obstruction by the secondary mirror of a
typical catadioptric mirror lens. You ain't got no problem.
Go take pictures and never fret about dust again. Even lots of dust.
Chuck Norcutt
Robert Swier wrote:
> Hello all,
>
> My beautiful Zuiko 100mm f2, which I bought new perhaps two years ago,
> seems to have acquired an internal speck of dust. Luckily, it is
> towards the outer portion of the element that it's on, and I don't
> think it makes any difference at higher apertures. However, it really
> bothers me!
>
> I'm certainly not going to attempt to open the lens myself. Any
> suggestions for what to do? Or should I learn to live with it?
>
> Robert Swier
> Toronto, Canada
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