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Glossary "T"

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Time setting that appears on some older cameras to lock the shutter open when the shutter release is pressed. It then has to be pressed again to close it.
Called 'extender', 'lens extender' or 'telephoto extender' by some manufacturers. (Not to be confused with an 'extension tube'!). A teleconverter is an accessory that fits between the camera lens and body to increase the focal length of a lens by 1.4x, 1.7x, 2x or 3x. When coupled with a 200mm lens, for instance, teleconverters would give these results: a 1.4x teleconverter gives an effective focal length of 280mm, while a 1.7x teleconverter increases this to 340mm, a 2x teleconverter to 400mm and a 3x to no less than 600mm. Teleconverters are compatible only with selected lenses, so always check with the manufacturer or retailer before buying. Although they will work with some zoom lenses, they're best used with (fast) prime lenses, since there usually is a drop in quality, and many prime lenses give a higher level of quality to start with. Besides changing the effective focal length, the effective aperture of the attached lens is increased by one or more stops as well. Autofocusing usually does not operate if the effective maximum aperture is greater than f/5.6 with the lenses/cameras from most manufacturers (in some cases greater than f/8, like on the Canon EOS 1V and EOS 3 cameras). And not all teleconverters support autofocus in the first place!
A lens with a focal length that gives a magnification greater than the naked eye.
A tank or tray containing temperature-controlled air or water that holds processings tanks, bottles or trays and maintains their solution temperature throughout the stages of processing.
A postage stamp sized copy of an image thats directly linked to the original. It has a small file size so it can be opened quickly and takes up little space on the desktop. These are often used in cataloguing programs and on Web sites.
Many digital cameras allow the playback of stored images to be viewed as thumbnail size. This makes it quicker to look through several pictures and highlight the one you want to erase, view or print. The thumbnails appear in a grid of, usually, nine and these can be scrolled through using the camera's mode buttons.
A lossless compression file format thats ideal for digital photography.
A camera with two lenses the upper one is the viewfinder lens that has a mirror reflex view and the bottom one is the taking lens.
A graph used in digital photography that displays tonal range. A straight line at 45 degrees shows that the contrast is unchanged. To modify contrast you can usually click anywhere on the line and pull it in any direction. You can usually also select one of the colour channels and modify contrast on just that channel which will affect the colour balance.
A darkroom technique that is used to change the blacks of a black & white image into a chosen colour. The paper base is not affected so whites stay white. Common toning colours are sepia and blue. This can be achieved digitally using most software’s hue/saturation settings or Photoshop’s duotones system.
These appear at the end of your Web address to indicate the location or commercial status of a Web site.For example, .com is usually used by businesses .org by non-profit organisations, .uk for United Kingdom sites and .jp for Japanese sites
A positive image on film that looks like the scene taken. This is often also referred to as a slide or trannie.
Flatbed scanners are designed to scan reflective material, but some accept an adaptor, often called a transparency hood, that has an integral fluorescent tube and is used to scan transparent materials. Some scanners are sold with the hood attached, others have it as an optional extra. These often allow up to A4 to be scanned but check, some of the budget options may only go up to 5x4in.A few scanners now have one built-in and use a tray that slides in and out of the unit. This avoids the need for the transparencies to come in contact with glass.
An autofocusing mode introduced by Yashica that you prefocus at a selected point and the system triggers the cameras shutter when the subject reaches this sharp point.
Most cameras have a thread in the base plate that’s used to connect to a tripod. This should be used when you want to take a picture at a slow shutter speed to avoid camera shake.
This is used to describe 24-bit colour mode that can produce as many as 16.7million colours, creating a ‘true colour’ image.
A camera that takes exposure reading of the light that passes through the lens.
A clour film that is balanced to remove the yellow cast that you would obtain when taking pictures in tungsten light sources of 3200K.
Short for Time Value thats more commonly known as shutter priority mode.
A small file thats dropped into the acquire folder of programs such as Photoshop. Then you would go to Twain>Acquire and the computer would connect to the scanner or frame grabber and operate it from within the program.
An indication of the brightness value of binoculars. It's similar to relative brightness, but you multiply the objective lens with the magnification and then find the square root of the resulting number. A higher number indicates the binoculars will be better for use in low light.