Long telephoto lenses can be some of the most expensive on the market, and when you need multiple focal lengths, the cost can quickly become prohibitive. Teleconverters offer a way to increase the range of lenses you already own, but they also have drawbacks you should be aware of. This excellent detailed video discusses teleconverters, their pros and cons, and when they are appropriate to use.
Come to you from John Wegenerthis excellent video discusses the use of teleconverters. Teleconverters almost always come in two options: 1.4x and 2x, which indicate the factor by which they increase the focal length of the lens you attach them to. This can be a pretty affordable way to get a lot more reach out of your goals, but it’s also important to be aware of the downsides. First, a 1.4x teleconverter decreases your maximum aperture by one stop, while a 2x teleconverter decreases it by two stops. Second, you can generally expect to lose some autofocus performance and image quality, especially when using a 2x teleconverter. And with the high resolutions of many modern sensors, you may decide that just post cropping is the best option. Watch the video above for Wegener’s full recap.