Rudolph Steineck's Reflexcamera patent

About the origin of Tessina, some attributed the design to Paul Nagel, the

designer of Kodak retina. This is rather misleading.

The Ur-Tessina was patented by Rudolph Steineck, who also designed the famed

ABC Steineck wristwatch camera.

Rudolph Steineck's orginal patent docment can be found in

<a href="http://v3.espacenet.com/origdoc?

DB=EPODOC&IDX=AT246552B&F=0&QPN=AT246552B">R. Steineck's Austrian patent

#246552 April 25,1966</a><p>

Fig 1 of his drawing is the Ur-Tessina

The basic design of Tessina patent belongs to Rudolf Steineck. However Paul Nagel did play a part in the development of Tessina:

Paul Nagel and Rudolf Steineck co-invented the shutter and film transport mechanism, the rewind crank for the Tessina camera, patent

submitted by Rosarie Steineck.

Hi Martin,

actually a real pity, they didn't realise the exposure meter, as described in the patent document.

Martin

Martin,

Yes, it is a pity, the design was for a real half frame TLR too.

I have a Tessina meter, it is cute and small, at 19.5g, it is the smallest exposure meter<P>

However in actual use, it is not accurate,( due to its small window and the moving scale). My test roll with Ilford PanF+ set at ASA 50 resulted in severe underexposure