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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