If you're unfamiliar with tele-extenders (also sometimes called teleconverters), they're worthy of an article unto themselves. In short, a tele-extender is a device that effectively increases the focal length of your lens, usually by a factor of 1.
The better Canon telephoto lenses are designed to work optically with the tele-extenders. Image quality will be acceptable, even at maximum aperture. As noted above, however, there is no free lunch.
4x and 2x tele-extenders is very versatile while being reasonably priced and compact in size compared to an expensive and weighty 400mm Æ'/2.8 or 600mm Æ'/4 telephoto. The 300mm Æ'/2.
Also referred to as a "tele-extender". Different tele-converters have different magnifying powers, ranging from 1.4 times to 3 times the lens's normal magnification (1.4X to 3X).
Get Closer Close-Ups With A Tele-Extender
An alternative to macro, sort of
We continue our look at tele-extenders an how they can add versatility to your lenses in general, and macro photography capabilities in particular.
Most often, I use either a Nikor 300mm f4.0, a really fast focusing lens, or a 70-200mm f2.8 with a 1.4 Tele-extender. Zooming can be quite useful in this situation. On occasion, I use a 200mm - 400mm f4.0 mounted on a tripod.
and how I can get the best example of animal behavior of the species. Where: I went to the best place to photograph anhinga at the nest—The Anhinga Trail, Everglades NP. When: February-March. How: with a 500mm lens plus a 1.4x tele-extender.
 See also: Camera, Image, Photograph, Lens, Photographer
  
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