Encyclopedia of how it works from abacus to zoom lens

Cover of: Encyclopedia of how it works from abacus to zoom lens |

Published by Marshall Cavendish in London .

Written in English

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  • Technology -- Popular works.

Edition Notes

Includes index.

Book details

Statementedited by Donald Clarke.
ContributionsClarke, Donald.
The Physical Object
Pagination245 p. :
Number of Pages245
ID Numbers
Open LibraryOL19452370M

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The Encyclopedia of How It Works: From Abacus to Zoom Lens [Donald Clarke] on *FREE* shipping on qualifying offers. The workings of batteries, cameras, meters, microphones, juke boxes, record players, and other modern gadgets, machines5/5(1).

Find helpful customer reviews and review ratings for The Encyclopedia of How It Works: From Abacus to Zoom Lens at Read honest and unbiased product reviews from our users.5/5(1). COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.

A zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens (see prime lens).

A true zoom lens, also called a parfocal lens, is one that maintains focus when its focal length changes. Most consumer zoom lenses do not maintain perfect focus, but are still parfocal designs.

zoom lens a lens system that allows the focal length of a camera lens to be varied continuously without altering the sharpness of the image Zoom Lens a combination of a telescopic attachment and an objective lens, forming an optical system with a variable focal length. The mechanical motions of the individual elements of the telescopic attachment ensure.

But his doesn't give a clear picture on the zoom lens working. -- Canon EOS D + Sigma DC mm. Two lenses in a row combine to make a new lens with a new focal length. The focal length of combined lenses increases with the separation between the lenses.

The animation is good but the math is even easier. The invention of the camera in the early 19th century led to an array of lens designs intended for problems of photographic lens design, creating a lens for a task that would cover a large, flat image plane, were well known even before the invention of photography due to the development of lenses to work with the focal plane of the camera obscura.

One of the most helpful tips that an old pro photographer once gave me was to use my zoom lens as a compositional aid rather than a way to get close to my subject.

He told me this just after I bought my first mm lens. I proudly showed it to him and told him [ ]. However, such numbers don't always tell the entire story, especially when looking at zoom lenses on a digital camera.

Manufacturers measure zoom capabilities of digital cameras in two configurations: optical zoom or digital zoom. It's important to understand the zoom lens because the two types of zooms are vastly different from each other.

p.1 #5 p.1 #5 Zoom Lens Wobble Hi Curtis I have a Tamron Encyclopedia of how it works from abacus to zoom lens book this lans is very good in all respects but there is a slight wabble whan fully extanded, the lens is 12 months old and in as new condition I dont think its a fault, maybe this slight play is common to all extanding lanses.

A camera lens is actually several lenses combined into one unit. A single converging lens could form a real image on the film, but it would be warped by a number of aberrations. One of the most significant warping factors is that different colors of light bend differently when moving through a lens.

The higher the optical zoom, the better the results. In a still camera, an optical zoom of 10x or more is called a "superzoom" lens. Note that if a still camera is advertised with "10x zoom," that does not necessarily mean optical zoom only. In many cases, the optical is 3x with the additional 7x being digital.

A variable focus lens (also called zoom lens) is a camera lens that can vary its focal length. In general, such lenses have a lower aperture than comparable fixfocus lenses. Depending on the manufacturer common zoom lenses (in the 30–mm focal range, for film photography) usually have a varying aperture, from 4 toperhaps to Byrd, E.

(), How Things Work: a Practical Guide For Teaching Scientific and Technical Principles (Parker). Clarke, D., Ed. (), The Encyclopedia of How It Works: From Abacus to Zoom Lens (A & W Publishers).

Crane, H. (), How Things Work (American Association of Physics Teachers). Other articles where Zoom lens is discussed: motion-picture technology: Principal parts: need for a variety of focal lengths (ranging from ultrawide angle to telephoto) to photograph scenes under the best conditions.

To make changing focal lengths more convenient, the lenses have sometimes been mounted on a turret, so that one out of a set of three lenses may be quickly selected. About. Zoom Lens is a label set to explore the implications of popular culture on the human condition and the duality of musical creations discovered through an intersection of both local and international sounds, focusing on emotive electronic & pop music.

Battle of Biggest Zoom Lenses Ever. Like they say, the more the better!. We tracked down the biggest zoom lenses. ever produced for normal photography purposes. From legendary Nikon mm to Sigma’s Green Monster.

How Zoom Lenses Work. Image via Wikimedia. According to a good Wikipedia definition, “a zoom lens is a mechanical assembly of lens elements for which the focal length (and thus angle of view) can be varied, as opposed to a fixed focal length (FFL) lens (see prime lens).”.

That sounds pretty straightforward, but let’s dive into how the mechanisms work to change the focal length. A wordless book which imitates a zoom lens - in reverse. On each page the focus moves back to reveal a little more.

Nothing is quite what it seems - the farmyard is in fact a model farmyard, which is a picture in a magazine, and so on - till at last the earth is seen from space as a tiny dot/5(). The only comparable zoom I have is the FA (it has a lens barrel made of plastic like the ones you mention).

It wobbles a bit, which is thought to be 'normal' for that lens. It was discussed on another forum some years back and all posters agreed. The design process is described for two different zoom lenses to show the efficiency and utility of these tools. The two zoom lenses are a 16x surveillance camera zoom lens working in the visible and a 3X zoom lens working in the visible and short wave infrared.

The design procedure for these lenses covers finding the paraxial solutions to Cited by: 2. Simple Telephoto Lens. A simple telephoto lens can be made by modifying the Galilean telescope to project a real image on the film of a camera. In a varifocal zoom lens the focal length is varied by moving the lenses, but the camera must be refocused.

With a true zoom lens, the focus does not have to be readjusted as the focal length is telephoto lens is shown mounted on a single. How to properly use a zoom lens to tell more dynamic stories in photography. Re: How does mechanism to extend zoom lens work.

In reply to skyglider • Basically it is a series of barrels with bushes linked to the lens elements sitting in various spiraling tracks that allow the lenses to move in relation to each other in very specific ways to very specific ratios. ▸ Canon Zoom Lens Sample Pictures As an Amazon Associate, I earn from qualifying purchases.

This site receives support when the B&H and other links provided are used to make any purchase. The Bilinda Butchers. bod [包家巷] Ceramiks.

But not all macro lenses focusbut nearly all can produce images that are 1⁄2 life size (). “Macro Zoom,” on the other hand, became a popular description for zoom lenses that focus close but are not—in the strictest sense—truly macro lenses.

And this is. The basic diagram of a zoom lens’ optical structure is this: Wide end on top, mid-range in the middle, tele-end bottom. But this is a simplified diagram.

Depending on the lens design, focal range and aperture, modern zoom lenses for DSLRs can have. A zoom lens design method, july 3, 1.

A Zoom Lens Design Method Dave Shafer 1) Start with the simplest possible monochromatic design, using low-order aspherics and appropriate vignetting 2) Optimize until pretty good performance is reached 3) Replace aspheric lenses, one at a time, with spherical doublets 4) Achromatize moving groups, then achromatize fixed lenses 5) Complete.

Amazing macro/abstract images created with a telephoto lens. Often when shooting in nature I use a telephoto lens to capture abstract nature images that look like.

Optical zoom synonyms, Optical zoom pronunciation, Optical zoom translation, English dictionary definition of Optical zoom.

A camera lens whose focal length can be rapidly changed, allowing rapid change in the size of an image. n a lens system that allows the focal length of a. Start studying camera lens. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

extreme wide angle lens that distorts the image so that straight lines appeared bent or bowed at the edge of the frame zoom lens. a lens that can be changed gradually during a shot, going from wide angle to telephoto or vice. While macro lenses are often used to take photos of things close up, how they’re used isn’t actually what defines them.

A macro lens has the ability to focus from infinity to magnification, meaning that the size of the image in real life is the same size as it’s reproduced on the sensor.

The magnification ratio tells you how the image. The elements in front of the aperture move in pretty much all constant aperture zoom lenses.

As one increases the focal length the magnification between the front element and the aperture diaphragm increases, thus making the entrance pupil larger without changing the physical size of the diaphragm.

It is the diameter of the entrance pupil, not that of the physical diaphragm that is used to. In digital cameras and digital video recording devices, a zoom lens let you to select any focal length within the len's range. The lens changes the angle of view and its magnifying power based on the zooming range selected.

Zooming out gives the photographer a wide-angle view that captures a wide expanse of a scene. The SIGMA Zoom is not a MACRO, and has max magnification of and close focus at 47cm. The TAMRON Zoom is a MACRO and has magnification of and close focus at cm.

Zoom Lens. Optically designed to permit the continuous varying of focal length. Depth of Field. Matte Work. A portion of the setting is photographed on a strip of film, usually with a part of the frame empty. Then, through laboratory printing, the matte is joined with another strip of film containing the actors (like a.

Other articles where Soft contact lens is discussed: contact lens: Soft contact lenses are usually comfortable because they allow oxygen to penetrate to the eye’s surface.

Their large size makes them more difficult to lose than hard lenses. Their delicacy, however, makes them more subject to damage, and, as with all contact lenses, they require.

Zoom Lenses and Zoom Lens Features Zoom lenses are the most versatile type of camera lenses and are used on all types of cameras. They allow you to take pictures at different focal lengths which will give different views of the same scene. The difference in my lens prescription as seen in the light.

The difference in one pic. The Disco skin works suprisingly well with the TOS starter boat. The Discographers Podcast Chapter 1: Gish The discovery of a Bengali book from the s sheds new light on Australian history. Define zoom lens. zoom lens synonyms, zoom lens pronunciation, zoom lens translation, English dictionary definition of zoom lens.

n. Encyclopedia; Tools. A; A; A; A; Language: Optical zoom is a true zoom lens like the one used on a film camera, the quality doesn't degrade when you zoom in with optical zoom.

Oppo's update for reno 10x.A zoom lens (also pancratic, varifocal or vario lens, especially in older texts) is a camera lens with continuously-variable focal allows the photographer to zoom in (increase the focal length, magnifying the central part of the scene) and zoom out (decrease the focal length and magnification, including a wider angle of view in the picture), without changing their position.

The ring's Zhusuan, or China's abacus, has seven rods with seven beads on each rod. Despite its small size, the rings still works as a counting tool.

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