Think of it this way. If you go to the zoo and want to photograph an animal
in its cage but there are bars between you and the animal, what do you do?
You open the lens up, put the lens right up to the bars and voila they
disappear. Now what you have are microscopic hairs and stuff on your 200mm
lens. If the lens makes big bars disappear do you really think a little dust
is going to cause a problem?
Get out there and use it, don't sweat it.
If it was dust, I wouldn't worry about it. But I was talking about the scratches which look like those on automobiles. You know, the millions of scratches after years of car washes.

regards,
Alan Chan

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