science

Tenax II

Tenax II is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Tenax II rather than just read about it. In short: During the 1930s, Zeiss Ikon (ZI) made a wide range of miniature cameras for the 35mm film format. Most cameras used the standard 24×36 mm frame size, like the Contax, Nettax and Super Nettel.

Key takeaways

Tenax II belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Tenax II to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Tenax II from memory before moving on to harder problems.

Reference excerpt

During the 1930s, Zeiss Ikon (ZI) made a wide range of miniature cameras for the 35mm film format. Most cameras used the standard 24×36 mm frame size, like the Contax, Nettax and Super Nettel. However, the ability to take images in fast sequence was a popular marketing element at the time, and several fast-operating models were made. Among these were the Otto Berning's motor-driven Robot cameras as well as the ZI lever-operated Tenax I and Tenax II. These have the smaller square format of 24×24 mm, enhancing faster frame advance. The Tenax II is a 35mm RF-camera launched by ZI in 1938. It produces 50 square exposures on a standard length of 35mm film. It has a Compur Rapid shutter, situated just behind the lens, with speeds from 1 to 1/400 second. The camera is wound and the film advanced simultaneously depressing the large lever on the right-hand side of the lens. At first it was only called the Tenax, but the following year a quite different and less sophisticated camera with the same name was launched, both designed by Hubert Nerwin, supposedly based on Otto Berning's original idea. The 1938 model is known as mark II, or just the Tenax II, while the simpler 1939 model, is known as the Tenax I. The "Tenax" name belonged to the C. P. Goerz company in Berlin, being used from 1907 on folding plate cameras and a Vest-pocket camera from 1909. C. P. Goerz became a part of Zeiss Ikon at its formation in 1926. The name was used again by ZI in the 1960s. The Tenax I was continued for a while in the 1950s in East Germany. The Tenax II has a proprietary bayonet lens mount as a provision for using different lenses, but only a small selection was made available during the few years the camera stayed in production, halted by Germany's war efforts. A small round window in a lateral extension on the lens barrel is aligned up in front of the camera's right-hand rangefinder window. It contains a pair of contra-rotating glass wedges synchronized with the lens focusing lever that provides accurate focusing by aligning a superimposed tinted image with the image in the viewfinder. STANDARD LENSES:

Carl Zeiss Jena ... Tessar 1:2,8 f=4cm Carl Zeiss Jena ... Sonnar 1:2 f=4cm ACCESSORY LENSES requiring a separate top mounted Van Albada type finder:

Carl Zeiss Jena ... Sonnar 1:4 f=7,5cm. Carl Zeiss Jena ... Orthometar 1:4,5 f=2,7cm

References

Illustrations

Worked examples

Example 1 — a first encounter with Tenax II

Start with the simplest possible case. Write down what Tenax II claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Tenax II before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Tenax II ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Tenax II

In research: Tenax II appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Tenax II in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Tenax II is common in secondary-school and first-year university syllabi. It links to neighbouring topics 135 film cameras, Carl Zeiss AG cameras, so understanding it makes those chapters shorter.
In everyday life: Look for Tenax II outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Tenax II in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Tenax II means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Tenax II out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Tenax II in simple terms?

During the 1930s, Zeiss Ikon (ZI) made a wide range of miniature cameras for the 35mm film format. Most cameras used the standard 24×36 mm frame size, like the Contax, Nettax and Super Nettel.

Why does Tenax II matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Tenax II?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Tenax II.