science

Prontor-Compur

Prontor-Compur 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 Prontor-Compur rather than just read about it. In short: A Prontor-Compur connection (also known as a PC connector, PC terminal, or PC socket) is a standard 3.5 mm (1⁄8 in) electrical connector (as defined in ISO 519) used in photography to synchronize the shutter to the flash. Etymology "Prontor" has its origins in the Italian word "pronto", meaning ready (and was a leaf shutter made by Alfred Gauthier). "Compur" is derived from the word "compound" (the "Compound" was a…

Key takeaways

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

Reference excerpt

A Prontor-Compur connection (also known as a PC connector, PC terminal, or PC socket) is a standard 3.5 mm (1⁄8 in) electrical connector (as defined in ISO 519) used in photography to synchronize the shutter to the flash.

Etymology

"Prontor" has its origins in the Italian word "pronto", meaning ready (and was a leaf shutter made by Alfred Gauthier). "Compur" is derived from the word "compound" (the "Compound" was a long-lived series of leaf shutters made by Friedrich Deckel).

History The term is derived from brands of widely marketed photographic leaf shutters manufactured from the early 1950s by two distinct, but now defunct German companies. Gauthier (which made the Prontor-S and Prontor SV models, amongst others) and Deckel (the Synchro-Compur model, successor to the Compound model). Both companies' brands, Prontor (from 1953) and Compur (from 1951), shared a common 1/8"-inch coaxial connector for shutter–flash synchronization. This convergence of design is not as coincidental as it might first appear, as the Zeiss organisation held a significant shareholding in both of these companies prior to the introduction of the shared connector. By the 1950s, Gauthier were manufacturing up to 10,000 Prontor shutters daily. The Gauthier company's essence lives on as Prontor GmbH, which is a wholly owned subsidiary of VTC Industrieholding GmbH. The Deckel company went bankrupt in 1994.

References

Illustrations

Worked examples

Example 1 — a first encounter with Prontor-Compur

Start with the simplest possible case. Write down what Prontor-Compur 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 Prontor-Compur 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 Prontor-Compur 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 Prontor-Compur

In research: Prontor-Compur 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 Prontor-Compur 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: Prontor-Compur is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electrical connectors, Photography equipment, so understanding it makes those chapters shorter.
In everyday life: Look for Prontor-Compur 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 Prontor-Compur in 20 minutes

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

Frequently asked questions

What is Prontor-Compur in simple terms?

Why does Prontor-Compur 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 Prontor-Compur?

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 Prontor-Compur.