Tony Northrup and Chelsea Northrup continue to offer up informative videos to help photographers understand and Learn the Art and Science of Photography. This latest video has Tony breaking down: the pros and cons of using teleconverters, how using one effects your focal range, image quality, aperture, and autofocus capabilities. So if you've been thinking about buying a teleconverter, this video may help you make a more informed decision before picking one up.
If you do decide a teleconverter is right for you, then the Canon and Nikon brand versions are listed below. Or you can find the considerably less expensive Tamron options here.
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.