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Digital Photography Glossary

Photography Glossary - T

Understand the terminology of digital photography, digital printing and digital imaging so that you will become a better photographer. Photographic terms such as Teleconverter, Telephoto Lens, Tiff, Twain, and more.



A Teleconverter is a lens accessory that mounts in between the camera and the lens to increase the effective focal length of the lens; so a 2x teleconverter would change an 80mm lens to a 160mm lens through magnification of the image. A 2x teleconverter doubles the f-rating of a lens, so that the image is darker. This is not a problem in bright light, but the image may be too dark if a teleconverter is used in lower light situations.


Telephoto Lens

Telephoto Lens

A Telephoto Lens has a long and fixed focal length (100-800mm). These long lenses enable you to compress a distance (and compress the sense of depth, as well) and pick out specific objects from far off. They have a strong resolving power and an inherent shallow depth of field, where the slightest lateral moment can take a subject out of view. Telephoto lenses are great for wildlife, portrait, sports, and documentary types of photography. They enable you to capture subjects from hundreds of feet away.

Click here to learn more: Understanding Camera Lenses



TIFF stands for Tagged Image File Format, and it can be a lossless compression format. In addition, TIFF is a flexible, adaptable file format for managing images and data by including the header tags (size, definition, image-data arrangement, image compression) defining the image's geometry.

Click here to learn more: Understanding Digital Photo File Formats



TTL (through-the-lens) is a light metering system in which the light meter takes a reading through the lens (just as the name says) in order to provide a more accurate exposure value, as TTL takes into account the light reduction properties of the lens, the ISO, the shutter speed and aperture setting.

Click here to learn more: Learn all about Exposure Metering Modes



Twain stands for “Toolkit Without An Interesting Name”. It is an acqisition interface that was created by a consortium of software developers as standard protocol for communication between scanners, imaging devices, digital cameras, and the computer software (i.e. Aperture, Lightbox, Photoshop).

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