Used with single lens reflex (SLR) cameras, a telephoto converter (more generally known as a teleconverter) is attached to another lens to increase its focal length. Teleconverters are commonly available in powers of 1.4x, 1.7x, and 2x.
Function
Telephoto converters can be used with either a fixed focal length lens (as in 85 mm) or a zoom lens (as in 28 to105 mm). When attaching a 1.4x teleconverter to an 85 mm lens, you multiply 85 mm by a factor of 1.4, giving you a new focal length of 119 mm. Similarly, a 28 to105 mm lens with a 1.4x teleconverter becomes 39 to147 mm.
Significance
A teleconverter extends the focal length of your lens without your having to purchase a separate longer lens. Teleconverters are significantly less expensive than a new lens. Teleconverters can also be attached to many different lenses.
Consideration
By attaching a teleconverter, you will compromise the sharpness of your original lens. If possible, purchase only a high-quality teleconverter.
Another Consideration
The power of a teleconverter will also change the speed of your lens. The fastest speed of a lens is determined by its biggest f-stop (or lens opening). If you are using a 1.4x teleconverter with an f2.8 lens, that f2.8 becomes an f4.
Benefit
Teleconverters are especially popular in wildlife photography. For example, using a 500 mm lens augmented by a 1.7x teleconverter can help you capture an exceptional photo of that distant and exotic bird.
Used with single lens reflex (SLR) cameras, a telephoto converter (more generally known as a teleconverter) is attached to another lens to increase its focal length.
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. Teleconverters are commonly available in powers of 1.4x, 1.7x, and 2x.Function
Telephoto converters can be used with either a fixed focal length lens (as in 85 mm) or a zoom lens (as in 28 to105 mm). When attaching a 1.4x teleconverter to an 85 mm lens, you multiply 85 mm by a factor of 1.4, giving you a new focal length of 119 mm. Similarly, a 28 to105 mm lens with a 1.4x teleconverter becomes 39 to147 mm.
Significance
A teleconverter extends the focal length of your lens without your having to purchase a separate longer lens. Teleconverters are significantly less expensive than a new lens. Teleconverters can also be attached to many different lenses.
Consideration
By attaching a teleconverter, you will compromise the sharpness of your original lens. If possible, purchase only a high-quality teleconverter.
Another Consideration
The power of a teleconverter will also change the speed of your lens. The fastest speed of a lens is determined by its biggest f-stop (or lens opening). If you are using a 1.4x teleconverter with an f2.8 lens, that f2.8 becomes an f4.
Benefit
Teleconverters are especially popular in wildlife photography. For example, using a 500 mm lens augmented by a 1.7x teleconverter can help you capture an exceptional photo of that distant and exotic bird.
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