I have never understood the use of the Chinese 4/3 manual extension tubes,
Chris. Sure, they provide the extension necessary for close-up work - but
being devoid of any electrical contacts, they disable AF, make it impossible
to control the diaphragm of any 4/3 lens, and most likely make it impossible
to use the focus ring too. Of course, you could argue that neither is
essential for close-up work! If I am forced to work with a dumb lens like
that, I would far rather use a manual focus macro lens, with a choice of
extension tubes or bellows, all fitted to the camera using a normal 4/3
adaptor. This approach means that you can use almost any 35mm film lens and
macro system, including (from my own experience) an Exakta-mount
Macro-Tessar lens fitted to a Nikon PB-4 bellows :-)
It would be a different story if you could choose to mix and match what you
describe as the camera base and lens base, because then you could build a
flexible system of lens adapters, but the vnedors have not caught on to that
possibility. In other words, don't waste your money on the Chinese 4/3
extension tubes!
Piers
-----Original Message-----
From: Chris Trask [mailto:christrask@xxxxxxxxxxxxx]
Sent: 11 October 2011 15:52
To: Olympus Discussion Group
Subject: [OM] Extension Tubes
--snip
There are extension tube sets avaiable from China for the OM 4/3 mount, and
I was wondering if anyone here has first-hand experience with these.
They're an interesting design where there is a camera base, a lens base, and
the tubes themselves that thread into the bases.
Chris
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