Archived posting to the Leica Users Group, 1997/11/11
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Re: the previous statement...
The III can be
removed from the camera in one piece, the II must have its prism housing
removed to mount and unmount it. The III is bigger and taller than the
II; it's tall enough that it leaves an empty space between the bottom of
its prism and the camera top plate; I'm not sure, but I think this is so
it can be used on the M5, which is taller than a normal M body. The II
will definitly not fit an M5.
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I used to run a Viso III with an M5.
Firstly, there are 3 modes to the Viso (III)'s operation.
Viz: mirror permanently up.
fast mirror release, immediately prior to shutter blind travel.
slow mirror raise, coincident with the (Viso) release being pressed
down.
The seperate release arm for the Visos has quite a long travel, several
millimeters, compared to the ordinary camera shutter itself. And the M5
requires a different Viso release to other M cameras, as the shutter release
is in a different place relative to the height of the Viso, cf. M1-M4, and
M6.
I have never seen this mentioned elsewhere, even in Leitz
literature/catalogues, but I had one installed when I bought both together
(an M5 and Viso III) from a knowledgable dealer. Sadly he didn't let me keep
the old release arm, but the M5 version works on my present M6 though is
screwed to one of its maximum settings.
Jem Kime