> It all depends on what the use of your extension tubes will be.
> Technically the Vivitar tubes are good, and since no glass is
> contained, optically they are on par with Olympus originals.
Actually, there is a major difference between the Vivitar and Olympus
tubes. The Vivitar ones have a smaller opening, and even though it won't
cause vignetting, you won't be able to mount some of the Olympus macro
lenses. I know that the 135/4.5 macro won't fit on the Vivitar tubes,
the protruding rear element is just too big. I suspect the 80/4 will
have the same problem. If you don't plan on using either of these
lenses then the Vivitar ones a probably fine.
-mark
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