Glen,
Chances are the Tamron tube is 45mm. Check the ratios on the side of the
lens. If the lens goes to 1:2 by itself, then the extension is 45mm. If
that holds, then use the 36 and the 12, crank your focus back a little bit
less than 1/4" and you're probably "close enough for government work". Now
just move camera and lens back and forth to focus....
Brian P. Huber
bphuber@xxxxxxxxxx
Troy, OH
-----Original Message-----
From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
On Behalf Of Glen Lowry
Sent: Friday, June 11, 1999 5:30 PM
To: olympus@xxxxxxxxxxxxxxx
Subject: Re: [OM] Ext tube for Tamron 90mm/2.5 SP
Brian,
Thanks for your response, I think you're right. Using a couple of these
tubes together, I seem to get greater than 1:1. The reason that I wanted to
know the exact size of the tamron tube was so that I might to use the
markings on the lens more precisely.
Glen
-----Original Message-----
From: Brian P. Huber <bphuber@xxxxxxxxxx>
To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
Date: June 11, 1999 9:12 AM
Subject: RE: [OM] Ext tube for Tamron 90mm/2.5 SP
>Glen,
>Depends on how much extension is built into the Tamron 90mm. If the
>extension is at least 22mm, you've got it:
>A. Extension required for 1:1 for 90mm lens = 90mm
>B. Vivitar extension tube set = 68mm (12 + 20 + 36)
>C. 90 - 68 = 22
>Bet you've got a lot more than 22mm there, most likely ~45-50mm. So with
>the Vivitar set, you can get greater than 1:1. Just don't forget to use
DOF
>button on lens to see what's really going on!
>
>Brian P. Huber
>
>bphuber@xxxxxxxxxx
>Troy, OH
>
>
>-----Original Message-----
>From: owner-olympus@xxxxxxxxxxxxxxx [mailto:owner-olympus@xxxxxxxxxxxxxxx]
>On Behalf Of Glen Lowry
>Sent: Thursday, June 10, 1999 11:57 PM
>To: olympus@xxxxxxxxxxxxxxx
>Subject: Re: [OM] Ext tube for Tamron 90mm/2.5 SP
>
>How long is the Tamron tube? I have and use a vivitar set (12/20/36mm)
and
>I'm wondering which extension if any will give me 1:1 precisely.
>
>glen
>-----Original Message-----
>From: Winsor Crosby <wincros@xxxxxxxxxxxxx>
>To: olympus@xxxxxxxxxxxxxxx <olympus@xxxxxxxxxxxxxxx>
>Date: June 10, 1999 8:47 PM
>Subject: RE: [OM] Ext tube for Tamron 90mm/2.5 SP
>
>
>>Brian wrote:
>>>Chip,
>>>Unless the Tamron extension tube is like the Vivitar Series 1 90 2.5
macro
>>>(Tokina) and has an element in it, there would be no advantage to either
>>>style of tube. If no optics exist, there would be no optical advantage
>>>Brian P. Huber
>>>bphuber@xxxxxxxxxx
>>>Troy, OH
>>>
>>>
>>>- -----Original Message-----
>>>From: owner-olympus@xxxxxxxxxxxxxxx
[mailto:owner-olympus@xxxxxxxxxxxxxxx]
>>>On Behalf Of Chip Stratton
>>>Sent: Tuesday, June 08, 1999 7:19 PM
>>>To: olympus@xxxxxxxxxxxxxxx
>>>Subject: [OM] Ext tube for Tamron 90mm/2.5 SP
>>>
>>>Is there a specific advantage to using the Tamron extension tube with
>their
>>>90mm/2.5 SP instead of say an Olympus auto tube?
>>>
>>>Thanks
>>>Chip Stratton
>>
>>I got an Olympus extension tube for mine after I got the lens. I find the
>>adapter is a pain in the a-- to remove and reattach which you would have
to
>>do each time you need to add a little extension to the Tamron lens. With
>>the Oly tube you just attach it to the body like a lens and then attach
the
>>90 with adaptor with a quick bayonet motion.
>>
>>Winsor
>>
>>Winsor Crosby
>>Long Beach, California, USA
>>mailto:wincros@xxxxxxxxxxx
>>
>>
>>
>>
>>
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