[rollei_list] Re: Diagram of Heidosmat viewing lense and Tessar 1:3.5 f=75mm lenses?
- From: "Dave Hunter" <dhunter@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 04 Oct 2007 16:14:51 -0300
Hi Richard:
I was able to make an aggreement with the vendor of the Rollieflex MX
I bought off eBay a couple of weeks ago, and which turned out to be
little more than a parts camera.
Perhaps its largest problem was the viewing lense, which had been
etched badly by fungus....
So, this morning, I got brave or foolish (use whichever you prefer),
removed the face, and dissassembled that lense. I was able to clean
off the damage very carefully using a fine plastic polish (Novus),
and the lense turned out remarkably well. Then while re-assembling it
I ran across the bi-concave lense and noticed it is hard to tell
which way it should be turned... Hopefully I do have it re-assembled
correctly - that might be the only problem. However, the end result
is a major improvement - I can actually see through the viewfinder.
Now, comes the problem of getting the viewfinder adjusted in synch
with the taking lense so that they both focus at the same point....
It is all a learning curve for me, but I am used to working on small
mechanical devices, so I kow all will work out in the end...
Thanks for your response!
Dave
On 4 Oct 2007 at 11:46, Richard Knoppow wrote:
>
> ----- Original Message -----
> > Does anyone have a dissassembly diagram for a Heidosmat 5
> > f:2.8/75
> > viewing lense for a Rollieflex, also looking gor a diagram
> > for the
> > Tessar 1:3.5 f=75mm lense....
> >
> > Either that, or does anyong know of a web site where these
> > are
> > posted?
> >
> There are approximate diagrams in several Rollei books.
> I suspect you want the assembly diagrams of the lens
> mounting. If so I have never seen any. The viewing lenses
> vary but the one's I've had apart for cleaning had spacers
> in them. Usually the sharp edge end of the spacer faces the
> element. Viewing lenses are plain Cooke Triplet types, the
> center element is bi-concave and the two surfaces are so
> close to the same curvature that its hard to distinguish
> them by eye, however, it makes a huge difference in
> performance if the element is turned backwards.
> I strongly suspect the spacer was used to adjust the
> focal length of the finder to match the taking lens.
> The Tessars in Rolleis seem also to vary somewhat in
> cell design. I have never found the way to take apart the
> front cell of the old (1930's)Zeiss Jena Tessars, I think
> they have a split front collar but am not sure. Oberchoken
> (Opton) Tessars have a front retaining ring.
> If you just want schematics of the two lens types they
> abound in various books on optics.
>
> ---
> Richard Knoppow
---
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