If you specificly want 1:1 then you can achieve that with the tube set to
it's shortest length - 65mm and employing only 25mm of the 90/2s 45mm
of built in focusing.
Giles
John Prosper wrote:
> >How does this combo affect macro photography ? Does it bring U to 1:1 ratio
> >? I doubt it.....
>
> The 90mm F/2 macro has a 45mm focusing helicoid. The 65-116mm AutoTube
> obviously adds up to 116mm; so the combination (45 + 116)mm yields 161mm
> of extension.
>
> Magnification (M) = Extension (E) / Focal Length (F)
>
> M = 161 / 90 = 1.7889 magnification, approximately.
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