Igorcmaera.com lists a Tech III board (with a 50mm hole) for $40. You might get
that one and use it for a pattern (if not for your existing lens).Mark S
-----Original Message-----
From: mark <mark@xxxxxxxxxxxxxxxxxx>
To: pure-silver <pure-silver@xxxxxxxxxxxxx>
Sent: Tue, Apr 16, 2019 8:38 pm
Subject: [pure-silver] Re: another update.
Myron you can send an attachment to me, but I doubt the list would appreciate
it. I suspected the one I got was for the IV, or maybe even later. It
definitely wasn't for mine, and I had to make the call without even a view of
the back. Probably should have just passed.
Probably a lot of things that would work IF push come to shove. Anything from
flat black yarn to really thin weather stripping might work as a light trap IF
it was a problem. I am not sure it would be at all. It may not be rocket
science, but to me its still new. Thanks everyone.
An extra thanks to Richard that takes the time to make this resource available
to all of us
-------- Original Message --------
Subject: [pure-silver] Re: another update.
From: Myron Gochnauer <goch@xxxxxx>
Date: Tue, April 16, 2019 6:19 pm
To: Pure Silver group <pure-silver@xxxxxxxxxxxxx>
... Mine is the III version 5 ...
The lens board I thought I found isn't the right one. It is slightly wider
so it won't fit in the standard. More importantly instead of a recessed ring
cut into the back, it has a protruding lip rising from the back. There are a
couple other minor differences.
I used to own a III, and currently have (on loan from my friendly X) two
lenses mounted on official Linhof III boards. I also have a home-made lens
board I used on the III for a 360mm TeleXenar. Plus a couple generic boards
that fit the III. The official Linhof boards have a slight indentation or
machined depression to match the fuzzy light trap material surrounding opening
on the Linhof. The others do not. All worked in all kinds of lighting
conditions.
The protruding lip you describe appeared with Model IV, and fits *into* the
Linhof opening. The III lens board depression matches the fuzzy material
*around* the opening in the III.
I made several model III lens boards from flat pieces of aluminum, using only
hand tools and flat black paint. They all worked in Arizona summer sun and
Ontario sunny snow. No fog, no leaks. Look at some of the Japanese wooden
cameras. They often get by quite nicely with flat lens boards and nothing in
the way of a light trap around the opening in the cameras.
... There does seem to be some sort of soft material that is around the
lens hole in the front standard that seems to match the ring cut in the back of
the lens board. Feels like a felt like material, and it's not thick at all. I
am sure a flat board would work, at least at first, but would it damage that
material?
I’m not sure what you call that material, but it isn’t magic. It’s just
black, opaque and compressible. Black yarn or string of an appropriate
thickness would probably work. But in my case the original material did not
seem to suffer from my totally flat lens boards. The boards do not fit so
tightly that they apply much force to the “light trap”. If you fret about it,
you could simply use contact cement to attach black cotton or linen cloth to
the lens board around (outside) the ring where the depression/ring is machined
on the official boards.
Can we send attachments to the Pure Silver group? If we can, I can attach
some photos of my lens boards.
I’ll check my supply of light trap material for fixing light leaks in elderly
cameras (like Nikon F or Pentax 67).
Myron
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