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.

Text, image and video via Tony Northrup