Use a teleconverter to zoom in on distance subjects.
Most photographers do not own super-telephoto lenses, but occasionally most find themselves in situations where a longer zoom would help. Teleconverters are devices used to increase the focal range of digital SLR lenses. Most camera manufacturers make their own, but third party teleconverters are also available. Teleconverter typically multiply lens focal ranges by 1.4 or 2. For example, a 2x teleconverter will turn a 100 millimeter lens into a 200 millimeter lens.
Instructions
1. Research lens teleconverters to find the right one for you. If you buy one that is manufactured by the same company as your lens and camera body, autofocus and all other features will be fully compatible with the system you are using. At the very least, make sure the teleconverter will fit on your camera. Teleconverters for Canon cameras should be EF mount-compatible, Nikon converters should be Nikkor compatible, and Sony users should use Alpha-compatible converters.
2. Attach the teleconverter between the lens and body of your camera system while the camera is off. Take the camera to a place with decent lighting for your first shot. Outside would be ideal. Teleconverters typically narrow your camera's maximum aperture by one to two stops. This forces your camera to require more light before making an exposure.
3. Try a variety of exposures with the teleconverter and acquaint yourself with the way it manipulates focal length. If you have more than one lens, use the teleconverter on all of them to understand its effect.
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