The Vivitars are well built and work fine. They are different lengths
than the Olys. Viv= 12, 20 & 36mm, Oly = 7, 14 & 25mm. Someone, perhaps
John Lind, recently propounded on the reasons for the differences. I use
An Oly 7mm plus the Vivitar set.
Be aware that Olys come in both auto and manual versions. With the
manual ones, you must stop down manually for each shot after focusing
with the lens open.
Moose
Conrad Vogel wrote:
I was curious as to the quality of non-Olympus extension tubes. I've
seen tubes on KEH and evilbay and the Oly ones seem to be about three
times as expensive, usually about $50 a pop. But then I've seen
evilbay Oly tubes go for $17. I'd like to get a set, but wondered what
they're worth, and if off brand tubes have any problems.
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