If the OLY box only says "Extension Tube 25", am I correct in assuming
that this is the manual version?
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.
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