Should You Use Teleconverters Instead of Longer Lenses or Cropping?

Long telephoto lenses can be some of the most expensive out there, and when you need multiple focal lengths, the cost can quickly become prohibitive. Teleconverters offer a way to get more reach from lenses you already own, but they also come with drawbacks you should be aware of. This excellent, in-depth video discusses teleconverters, their pros and cons, and when they are appropriate to use.