Alan,
I have the old version 49mm Tamron and I have the Tamron Extension Tube for SP
90/2.5 (1:2-1:1) that I thought went with it. Am I wrong? I really don't know
as I
haven't attached one to the other and used them that way. This Tamron Extension
Tube is a hollow tube.
GeoW
>
> It may depend which version you have. I have the oldest version,
> which takes 49mm filters. It can NOT be used with an extension tube.
> The rear element remains at a fixed distance from the film when you
> focus. If you add a tube, it is not possible to focus. The special
> Tamron "extension tube" is really a matched teleconverter.
>
> If your version is different, you would need a 45mm (not 25mm)
> extension tube to get from half-size to life-size.
>
> Alan Wood
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