science

Zeiss Planar

Zeiss Planar 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 Zeiss Planar rather than just read about it. In short: The Zeiss Planar is a photographic lens designed by Paul Rudolph at Carl Zeiss in 1896. Rudolph's original was a six-element symmetrical double Gauss lens design.

Key takeaways

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

Reference excerpt

The Zeiss Planar is a photographic lens designed by Paul Rudolph at Carl Zeiss in 1896. Rudolph's original was a six-element symmetrical double Gauss lens design. While very sharp, early versions of the lens suffered from flare due to its many air-to-glass surfaces. Before the introduction of lens coating technology, the four-element Tessar, with slightly inferior image quality, was preferred due to its better contrast. In the 1950s, when effective anti-reflective lens coatings became available, coated Planars were produced with much-improved flare resistance. These lenses used the Zeiss T coating system, which had been invented by Olexander Smakula in 1935. They performed very well as normal and medium-long focus lenses for small and medium format cameras. One of the most notable Planar lenses is the high-speed f/2.0/110 mm lens for the 2000- and 200-series medium format Hasselblad cameras with a similar version available for the Rolleiflex 6000 series cameras.

See also Carl Zeiss Planar 50mm f/0.7 Biotar Tessar Sonnar Biogon Distagon Flektogon Hologon Photographic lens design

Further reading Nasse, H. Hubert (July 2011). "From the series of articles on lens names: Planar" (PDF). Camera Lens Blog (CLB) (40th ed.). Carl Zeiss AG, Camera Lens Division. Retrieved 2013-06-08. (NB. German: [1]) {{cite web}}: External link in |quote= (help)

References

Carl Zeiss lenses [2] Archived 2011-03-15 at the Wayback Machine Carl Zeiss SLR Lenses - Planar T* 1,4/50 [3]

Illustrations

Worked examples

Example 1 — a first encounter with Zeiss Planar

Start with the simplest possible case. Write down what Zeiss Planar 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 Zeiss Planar 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 Zeiss Planar 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 Zeiss Planar

In research: Zeiss Planar 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 Zeiss Planar 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: Zeiss Planar is common in secondary-school and first-year university syllabi. It links to neighbouring topics Photographic lens designs, Photographic lens stubs, Zeiss lenses, so understanding it makes those chapters shorter.
In everyday life: Look for Zeiss Planar 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 Zeiss Planar in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Zeiss Planar 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 Zeiss Planar out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Zeiss Planar in simple terms?

The Zeiss Planar is a photographic lens designed by Paul Rudolph at Carl Zeiss in 1896. Rudolph's original was a six-element symmetrical double Gauss lens design.

Why does Zeiss Planar 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 Zeiss Planar?

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 Zeiss Planar.