You are forgetting that the lens itself can rack out a loooong way. The
Tamron extension tube is (if I remember right) 26 or 28 mm, with the rest of
the extension provided in the lens helicoid.
Whether you fit the Tamron tube or any other tube to an old or a new
version, it can't possibly fit anywhere other than between the rear lens
element and the film plane. Unless you fit it with a hacksaw and (wait for
it) silicone sealant.
Or have I missed something?
Piers
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On Behalf
Of Roger D. Key
Sent: 20 February 2004 16:39
To: olympus@xxxxxxxxxx
Subject: [OM] Re: Tamron 90mm Question
Regarding the amount of extension, I seem to remember calculating that one
needs around 45mm to go from a 90mm 1:2 to a 90mm 1:1 ; in other words, all
three olympus auto tubes (25+12+7 = 44mm). Or is that wrong?
Roger Key
Bill Barber wrote:
In a message dated 2/20/2004 9:48:03 AM Central Standard Time,
fred42@xxxxxxxxx writes:
Is there any reason why I would need the Tamron one specifically?
Only if you are into pain and inconvenience do you need to track it down.
Use whatever extension tubes you own. An auto tube is an auto tube. There
are no optics nor magic to the one labeled Tamron. With the Tamron tube
(like the Tamron teleconverters) you hav eto remove the adaptall mount
install the tube and then attach the adaptall mount to the rear of your
tube.
Which model Tamron 90mm do you have? You may want to locate the hood for
it, which can be more difficult than finding the tube. Bill Barber
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