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R: [OM] Re: Huh? 100 f/2.8 + 65-116 tube

Subject: R: [OM] Re: Huh? 100 f/2.8 + 65-116 tube
From: "Marco" <tom@xxxxxxxxxxxx>
Date: Thu, 10 Jun 1999 22:02:16 +0200
any subject farer than 4 focal lenghts from film plane has 2 focuses at 
different magnifications. If you put a subject at 400mm from film plane
you'd get only one focus with any 100mm lens (and life-size magnification).

The 2 magnifications you get are exactly each 1/ of the other.

I believe the auto tube is to long for the 50mm and too short for the 200 mm
for letting you have both focuses within its range.

Marco

----------
>Da: MorrisMini@xxxxxxx
>A: olympus@xxxxxxxxxxxxxxx
>Oggetto: [OM] Re:   Huh? 100 f/2.8 + 65-116 tube
>Data: Sab, 5 giu 1999 18:13
>

> I tried this with a 200 f/5 and 50 f/1.8, but they never came back into focus
> at any point in the travel.
>
> What is happening here? 

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