I have one of these, as well as the Kiron 2x converter.
The Vivitar is reputed to be built by Kiron and of the same high quality.
I have used it with a Zuiko 135 2.8 and Tokina 80-200 2.8 and have not seen
vignetting.
All in all I am very happy with it, also considering I got it for 23 Euro.
The Oly will cost you a lot more.
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Wim Verheyen, Houthalen, Belgium, aemit@xxxxxxxxx
Photography and synthesizers
http://users.skynet.be/aemit/ http://aemit.fotopic.net/
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