[rollei_list] Re: a little unparallel of lens panel

On 7/23/06, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote: 

----- Original Message -----
From: "steven woody" <narkewoody@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Saturday, July 22, 2006 8:33 PM
Subject: [rollei_list] Re: a little unparallel of lens panel


>>
> thank you belcher and Knoppow.  i think i have to mostly
> agree with
> Knoppow's opinions.  the problem is, by your help, can i
> get contact
> with a repair person accessiable to me? i currently live
> in Guangdong,
> China.
>
> to belcher,
>
> i think i can not tell what is front panel and what is
> lensboard. they
> seem attached together and when go wobbling.
>
> -
> woody
> ---
> Rollei List
>
  China is a vast country, there MUST be someone competent
there. I am not sure if there are other list members in
China but for some reason I think there are.
  The lens board is the part the shutter and viewing lens is
mounted on. It is mounted on a Y shaped bracket which is
moved back and fourth by a system of cams for focusing. It
is not visible from the outside. The brackets are held quite
rigidly by guides in the sides of the camera.
   The front panel is a trim piece that is screwed onto the
lensboard. This is the part you see from the outside. Some
front panels are a single piece, some are in two peices. The
bayonet mounts for the lenses are a part of the front panel.
The lens board itself is shimmed to get it exactly parallel
on the focus brackets. The front panel has shim washers
under the screws that hold it to the lens board. It is
relatively thin metal and will bend just a little this way
and that. The shims for it are to get the border around it
and the body of the camera even. Also, the distance the lens
board is from the camera front casting varies just a little
with the particular lens. Lens focal lengths are nominal and
actual lenses vary a little from this value. So, the
clearance of the front panel from the camera body must be
enough to allow focusing at infinity without the edges of
the panel running into the camera body.
   This is all simpler than this word description makes it
sound. In short, the shims between the lens board and the
focus brackets are very important because they keep the lens
parallel to the film. The shims for the front panel are
important mostly for appearance, although the clearance must
be enough.
   Sometimes one sees a camera where the border around the
edges of the front panel are not even. Many people think
this means the camera has been dropped or otherwise damaged.
In fact, its usually just a missing shim, or the front panel
is very slightly twisted.
   Rolleis are very hard to break in ordinary use.

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


Knoppow, i would thank God if you were live in China :-)

can i deduce from above discussion that, if what i described the
wobbling can be seen not only from the front panel but also from the
front elements of the two lens, so this is a lens mount uneven
problem, not a front panel problem? am i right?  actually, i noticed
the front elements of the lens moved in a exactly the same way as the
front panel.


-
woody
---
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