Lens Elements and Groups
When shopping for camera gear, you've undoubtedly encountered listings detailing how many "elements" and "groups" certain lenses have.
Lens elements
Techniques Glossary Lens elements
The individual pieces of glass that form the overall optical construction.
Lens elements.
5. Fine-tuning the Light
With a lens on the front of the camera, you can choose between having an image that's in focus or one that's out of focus but there really is no in between.
The lens elements are made of transparent materials. Glass is the most widely used material due to its good optical properties and resistance to scratching. Sometimes lenses are made of materials such as quartz or fluorite.
lens barrel - The tube that contains the lens elements.
lens cap - Hard, protective cover that clips over the front lens element when the lens is not in use.
A layer or multiple layers of thin anti-reflective materials applied to the surface of lens elements to reduce light reflection (flare) and increase the amount of transmitted light.
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Sometimes applied to an iris diaphragm whose blades operate between lens elements. SHUTTER, FOCAL-PLANE-A shutter located near the focal plane and consisting of a curtain with a slot that is pulled across the focal plane to make the exposure.
However, its not always easy to tell where the lens elements are. Check with your housing manufacturer for the best alignment.
You can use ports made out of optical glass or acrylic.
Image Stabilization in Lens Elements.
Nikon is using similar technology to compensate for unintentional camera movement.
Glass with ED properties indicating special rare earth glass or special formulated glass that limiting or correcting of light rays passing through the lens elements to achieve all spectrum of colours to falls on the same plane of focus - especially ...
However, a teleconverter does contain lens elements. A teleconvertor increases the focal length of a lens, but it does not change the minimum focus distance. This results in an increase in magnification.
Three UD (Ultra-low Dispersion) glass lens elements correct chromatic aberrations and floating elements ensure sharp definition at all subject distance. A ring USM provides silent AF and full-time manual focusing.
Reflected light; from lens elements, sun, metal, etc. Appears as non-uniform haze or bright spots on the film or digital frame, often taking the shape of the aperture, generally caused from shooting towards the light source.
The final solution to cleaning fungus from lens elements when all else fails seems to be toothpaste. My "UG" Nikkor-P 105/4 bellows lens was giving me decidedly foggy images.
6L is an interesting lens in that, while it's technically an L series lens with fluorite and UD lens elements, it doesn't have the tough build quality of a typical L series lens sold today.
Lens Coating A layer or multiple layers of thin, anti-reflective materials applied to the surface of lens elements to reduce light reflection and increase the amount of transmitted light.
Cheaper lenses, especially those that come built into a compact camera, can often contain plastic lens elements.
From the front the camera appears to be fairly conventional, although the lens does seem oversized for the camera body (large diameter lens elements normally means good).
Cause: Front and/or rear lens elements dirty. Solution: Clean with lens tissue and cleaning fluid. Use one drop of cleaning fluid on a tissue and clean lens in a circular motion starting from the center.
Lens coating
Transparent coated on lens elements that helps reduce reflections and flare to improve image contrast.
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In a zoom lens, you can move different lens elements back and forth. By changing the distance between particular lenses, you can adjust the magnification power -- the focal length -- of the lens as a whole.
Zoom lenses contain more lens elements than a fixed-focal length or prime lens, and therefore aren't quite as sharp. Naturally, the angle of view decreases as you increase the focal length and magnify the image.
The reflected light from lens elements that appears as a non-uniform haze or as bright spots on the film. This usually happens when a bright light directly enters the lens.
flash card: ...
Optical zoom is a method of narrowing the angle of view by changes in the arrangement of lens elements.
BETWEEN-THE-LENS SHUTTER - A shutter situated between two lens elements.
BITMAP - A bitmap is a picture that is an arrangement of tiny squares of different colors, called pixels. For the file extension, ".bmp," see .BMP below.
An overall decrease in contrast caused by light being reflected off, instead of transmitted through, a lens surface; controllable through the use of multilayer coating of individual lens elements in a lens; ...
Does anyone have any experience cleaning the inside of the lens elements?
Claimed improvements include advanced lens elements and enhanced durability for high-speed autofocus and high-performance optical image stabilization. Read more ...
Focusing
Adjusting the position of the lens elements to bring the image into focus, i.e. so that it is clear and sharp.
Full automatic
In this mode, the camera not only controls the aperture and shutter but all other settings (e.g. flash).
Contemporary lenses are invariably of the compund type. That is, they are made with multiple lens elements, combining to correct image aberrations. This is necessary because light is not single, unified source, but has different color and wavelengths.
It does this by moving lens elements to change the focal length of the camera's lens. Some of the best optical zooms can be as much as 10-to-1 (10x). Most medium priced digital cameras will have a zoom in the 6-to-1 (6x) or 3-to-1 (3x) range.
-Supplementary lenses - additional lens elements used with the standard camera lens to provide a new focal length.
This could cause condensation on lens elements or ports when you enter the cooler water, or worse a flood from a popped "0" ring seal. Keep your equipment cool by covering it with a towel when you bring it on deck for the dive.
[Note that since most camera lenses are made up of more than one lens elements, the definition "middle of the lens' is adjusted slightly.] ...
There are several other terms to take into consideration when buying a digital camera lens to make sure you are making the best purchase. If your lens utilizes aspheric lens elements, ...
Lens barrel
A metal or plastic tube with a blackened inner surface, in which the lens elements and mechanical components of the lens are mounted.
There is some sort of mechanism in the camera that moves the lens elements to bring the image into focus. Some cameras are quite good at this and some have difficulty in low light situations.
Fig. 1: For the sake of simplicity, this diagram shows only one lens element. In actuality, an interchangeable VR lens has many lens elements.
Image stabilization. A technology that compensates for camera shake, usually by adjusting the position of the camera sensor or lens elements in response to movements of the camera.
Extension tubes are hollow tubes of varying lengths that increase the focal distance of the lens by moving the lens elements further from the film or sensor. Extension tubes on current cameras generally disables the autofocus feature.
With two extra-low dispersion glass elements and three aspherical lens elements, the lens delivers high-resolution, high-contrast images while minimising chromatic aberration. Ideally suited for use on Nikon DX-format and FX-format cameras.
(Your condensed breath on the lens also works well.) Never put cleaning fluid directly on the lens; it might run between the lens elements.
 See also: Element, Lens element, Lens, Camera, Image
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