At 03:10 2/2/02, you 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.
>
>Corey
They don't come in beautiful, velvet-lined boxes, each with it's own little
instruction sheet :)
AndrewF
The Vivitar AT-21 set does come in a hard leather [??] case with a snap
cover. Mine was bought used. Although the previous owner didn't ditch the
case, the instructions were missing and the oval JMDC stickers had been
removed.
The OM tubes are made much like the lenses with hardened flanges. The
"hole" down the center of the tube is slightly narrower on the Vivitar
set. If you intend to use it with a lens that has a rear protruding
element, check fit first (may interfere with the mechanicals holding the
rear element). There is no additional light loss with any lens I've used
on them though. The Vivitar AT-21 [auto] tubes look to be aluminum with
fewer parts, but in use they work just as well and seem just as sturdy. I
found the Vivitar set for a superb price while I was biding my time for
good prices on the OM Auto Tubes.
-- John
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