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Fhotoace provided a great answer. When you insert a teleconverter between the camera body and a lens, you'll require more light than before. The glass in the teleconverter absorbs a bit of light, so less light is passed along to the the sensor. To put it differently, you'll need more light coming into the lens for the *same* amount of light to reach the sensor.
For the converter that you were talking about, that amount of light is expressed as '2 stops'.
The results of this are:
* You'll have to use a slower shutter speed and/ or a higher ISO setting to compensate for those 2 stops.
* And the lens can become too sluggish for the auto-focus to work properly. With some teleconverters, the AF will not work at all.

2007-04-26 00:10:44 · answer #1 · answered by OMG, I ♥ PONIES!!1 7 · 2 0

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