Teleconverters: Is the extra reach worth the penalties?

Teleconverters (also known as tele-extenders) can give you extra reach, turning your 300mm lens into a 420mm or 600mm lens... but with serious penalties to sharpness, light-gathering, and autofocus. This video shows you how teleconverters work and will help you decide whether they're right for you. Don't forget to SUBSCRIBE!
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