Re: A strange Zeiss mono-tube
From: Gordon Couger (gcouger_at_XXXXcouger.com)
Date: 12/11/04
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Date: Sat, 11 Dec 2004 00:16:36 -0600
Kevin Sunley wrote:
> I have an obscure question that I'm hoping someone may know
> something about.
>
> It concerns a West German Zeiss straight (non-inclined) microscope
> mono-tube, such as one used to mount a camera. This tube (see picture)
> has a collar to allow the tube length to be adjusted, but this feature
> is not directly related to my question.
>
> The tube can be seen here:
>
> http://www.sunley.ca/microscope/images/images.html
>
> .. click on the "Zeiss non-inclined mono-tube with lens".
>
>
> Now comes the question. It concerns the lens that is factory mounted
> inside the tube, which can be seen if you look closely at the
> picture showing the bottom of the tube.
>
> The person I bought the tube from was quite confident that its
> origin was from a Zeiss microspectrophotometer which was built with
> some quartz optics. As it turns out the lenses do not seem to be
> quartz (no transmission below 340nm), but it still seems to be an
> interesting part.
>
> Firstly, the lens inside the tube, although it seems to be factory
> mounted, seems to be a post-manufacturing addition to a regular
> adjustable monotube. This is because the item was painted prior to
> milling out portions of the tube's inside to fit the lens mount.
> This might indicate that it may be a part from a unit which was not
> manufactured in a great quantity.
>
> Secondly, although my first thought was that it was for changing the
> tube length of the optical path, the lens instead seems to function as
> one of two things:
>
> 1) a permenantly mounted bertrand lens (most likely)
> 2) some sort of permentantly mounted eyepiece,
>
> This is because if I use the tube with a Zeiss eyepiece, I see a
> very sharp, clear, and magnified view of the back focal plane of the
> objective.
>
> If I use the tube without an eyepiece, a view of the specimen can be
> seen just by looking down the tube, but it is hard to focus on, and
> you have to keep your eye very(!) close to the tube.
>
>
> So I'm leaning towards a bertrand lens system, but not ruling out it
> being a lens to use the microscope with some type of video camera
> and/or photomultiplier system. The latter seems unlikely though, as
> a tube used with Zeiss' microspectrophotometer would likely have had
> quartz lenses (since most of the units allowed %T measurements into
> the far-UV).
>
>
> So can anyone think of any reason or type of equipment that would
> have a non-removable bertrand lens in it. I know there are many
> analytical uses of microscopes, including microspectrophotometers,
> FTIRs, etc., and it could be from any of these, or something
> completely unrelated like a dedicated conoscopic microscope (if such a
> thing was ever made).
>
> The last bit of possibly helpful information I have is that I have
> seen the exact same type of adjustable straight tube, but without
> any lenses internal to it. But the non-lensed tube did not have the
> white ring around its base. So the ring seems to indicate that the
> tube has some type of special use, but that's all I know.
>
> Also, the lenses do not seem to be coated (which seems unusual for
> most post-WWII Zeiss optics I've seen).
>
>
> Any and all guesses are appreciated.
>
Kevin,
That is an eyepiece tube that mounts on the standard Zeiss
dovetail and appears to have a diopter adjustment. It generally
used to replace the binocular head piece and give a solid
vertical mount for a camera. That tube is also very handy for
aligning the rest of the scope.
I expect the diopter adjustment is so the tube can be set so it
is parafocal with the binocular head piece. I expect even Zeiss
optics vary enough that there are binocular head pieces that are
not exactly the same.
Gordon
Gordon Couger
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