>
> First of all, I noticed (unless my eyes are getting out of
> service nowadays) that the lens seems to have
> internal (inner) focusing: that is, turning the focusing ring
> from 0.25m to infinity (and backwards) doesn't
> result in a lens barrel lenght variation, as it is common for
> most lenses (although the focusing plane do
> effectively moves according to the scale on the lens barrel).
> Could other 18mm owners confirm?
Yeah, internal focussing.
>
> Then, when mounting the 49->72mm step up adapter, that sort
> of "metal ring" that rises up between the
> lens and the filter ring itself starts turning a bit (let's
> say 5-10 degrees). Then stops when the 49->72mm
> adapter is fully in place. Is this the "correct" behaviour
> (the metal ring seems to tighten the 49->72mm
> adapter to the lens), or should I suppose something's wrong
> with it (i.e. it is getting loose)?
>
Doesn't happen with mine, sounds like a loose retaining ring.
...Wayne
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