How To Use Focal length In A Sentence
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They have exploited this radical abbreviation of focal length to develop a prototype of a credit-card-thin camera.
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Calculate the equivalent 35mm film focal length from the AOV AOV = arctan (28.62/72) * 2
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A typical lens has a focal length ( f ) of 625 mm.
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Experiments on dynamic focusing control of the TN-LCSLM based on Fresnel zone lens are carried out. Measured focal lengths are in good agreement with the designed ones.
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The aperture size (area of the aperture) of a lens could be calculated from focal length and the correspondent f-number.
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The rule of thumb is never to hand-hold the camera at a shutter speed lower than your lens' focal length.
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The long focal length portion of the lens focuses to one fovea for viewing in air; the other short focal length focuses below water.
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The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.
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It is an optical device, somewhat like a viewfinder, which allows me to vary the focal length at will.
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My continued doubts about the Nikon 10-24 regard the "smeary" corners at wider focal lengths on most, but not all, images I've seen.
News: Digital Photography Review (dpreview.com)
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In fact, most professional bird photographers use a 500 mm or 600 mm lens coupled with a teleconverter to extend the focal length as much as possible.
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Properties of a parabola All parabolas are similar. Focal length a determines the magnitude.
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As the action began, I used a variety of longer focal lengths to pick out details over the next couple of hours.
Times, Sunday Times
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By male the sexy stunner that becomes female, appear before people and make objective presence, how should people adjust the cognitive focal length in him cerebra?
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The monofocal lenses have fixed focal length while varifocal lenses have ability to adjust between different focal lengths using single lens.
Varifocal Auto | Surveillance
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focal length
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Define the following term: astigmatism, binocular vision, focal length, lens accommodation, optic disk, papillary constriction, retinal field, visual field.
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The prisms immediately solve the magnification problem because of the availability of long focal length lenses in which then the distance between then is effectively quartered.
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Such calculations work out very neatly if you always double your focal length, but get a bit more complicated for odd bellows or lens extensions.
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A rare catadioptric lens uses mirrors to increase focal length.
Quick tips to shoot holiday lights
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The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.
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Define the following term: astigmatism, binocular vision, focal length, lens accommodation, optic disk, papillary constriction, retinal field, visual field.
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One evening he was observing with a rather crude refractor (a lens telescope), with a focal length of 24 feet.
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Our SBC cavity incorporates a single collimating lens located a focal length away from a 1 - D array of laser emitters operating at different wavelengths, with the grating positioned another focal length away on the other side of the lens.
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The short effective focal length provides focused images at distances from lens contact to near infinity, even in air.
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He discusses camera types, lenses, focal length, flash, light, digital photographs, and film types and speeds.
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The literal interpretation of the f/N notation for f-number N is as an arithmetic expression for the effective aperture diameter (input pupil diameter), the focal length divided by the f-number: D = f/N. Noooo!!!
Further aspiration.
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Yet Stork determined the probable focal length of a concave mirror made by inverting and silvering the convex mirror shown in the painting.
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Also still an urban legend: the "helmet-mounted downblouse cam" - I haven't yet figured out the right aperture & focal length to use.
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The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.
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If you're taking a picture of a mountain range, you might want to use a telephoto lens, a lens with an especially long focal length.
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When a lens is used to focus the sun's rays onto a piece of paper the distance of the paper from the lens is called the focal length.
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Shutter speeds, aperture, choice of film speed, focus, focal length… you get what I mean.
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The object glass is three inches; the focal length forty-three inches; and the telescope, when drawn out, with the pancratic eyepiece attached, is about four feet.
Men of Invention and Industry
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As before, the images were taken with a constant focal length, lighting, aperture, and shutter speed.
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All these f-numbers, focal lengths, film speeds and apertures are actually really simple to get to grips with once you understand how they relate to each other and to the finished picture.
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Because the zone plate focuses to a point, it must match the focal length of the camera.
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As the diameter of the lens was so small in comparison with its focal length, its want of achromatism was inappreciable.
Experimental Determination of the Velocity of Light Made at the U.S. Naval Academy, Annapolis
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The well-known telescopist Goldschmidt (who commenced astronomical observation at the age of forty-eight, in 1850) added fourteen asteroids to the solar system, not to speak of important discoveries of nebulæ and variable stars, by means of a telescope only five feet in focal length, mounted on a movable tripod stand.
Half-hours with the Telescope Being a Popular Guide to the Use of the Telescope as a Means of Amusement and Instruction.
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In addition to considering focal length, pay attention to the "speed," or f-number, of your lens.
PCWorld
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And more: when the reddened is baritone and a andante shutter pace is engaged, tending staleness be paying to the hard equilibrise between the subject's indifference from the lens, its pace and seek of move nonnegative the lens 'focal length, aperture and test ikon filler required.
Planet Malaysia
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This discrepancy in focal length is a measure of the astigmatism, often referred to as the astigmatic difference, and will depend on the inclination angle of the light rays and the lens power (as opposed to the shape or refractive index).
Undefined
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Keep in mind your different focal lengths.
Photographers Handbook
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Real images occur when objects are placed outside the focal length of a converging lens or outside the focal length of a converging mirror.
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It's the same with lenses; in addition, the self-centering problem is even more pronounced for meniscus shapes and other optics with long focal lengths.
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Starting from the ray path equation, object-image relationships are found and used to determine the equivalent focal length and the principal planes of tapered GRIN fiber.
