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Re: [OM] ...telescopic tube....

Subject: Re: [OM] ...telescopic tube....
From: "Giles" <cnocbui@xxxxxxxxxxxxx>
Date: Mon, 4 Dec 2000 22:56:52 +0000
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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