I don't have a 7mm extension (yet), but a 14mm extension decreases the maximum
focus distance to less than two feet. What I want to do is increase the working
distance to the subject.
Matt
>Date: Sat, 25 Mar 2000 23:19:42 -0800
>From: "Gettis John" <jgettis81@xxxxxxxxxxxxx>
>
>- ----- Original Message -----
>From: "Matt BenDaniel" <matt@xxxxxxxxxxxxxxx>
>
> > I very gingerly attempted to mate a 90/2 macro to a 2X-A and discovered
>that the 90/2 has a tiny metal tab that seems to have been specifically
>designed to prevent use of the lens with the 2X-A. I infer the reason for
>that is that if the lens were to be focused at infinity, the rear element
>would come into contact with parts in the 2X-A, a potential disaster. (I
>think older lenses like the 55/1.2 do not have this tab feature).
> >
> > I very gingerly tested the 90/2 with a Tokina doubler and it seems to work
>without any contact occurring. I think it yields a 180/4 1:1 macro.
> >
> > OK, am I being really stupid here and should I cease and desist this
>behavior immediately?
> > Or, am I onto something useful?
>
>You might try a 7mm or 14mm extension tube between them.
>
>John Gettis
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