As a 1.4x teleconverter, the focal length of the attached lens is magnified by a factor of 1.4x, with a 1 f/stop reduction in aperture rating, so a 70-200mm f/2.8 zoom effectively becomes roughly a ...

Just like with any 2x teleconverter, the focal length of the attached lens is doubled, with a consequent aperture reduction of two f/stops. As such, a 70-200mm f/2.8 zoom effectively becomes roughly a ...

Teleconverters provide an affordable way to increase the focal length of a lens – but should you buy one? Teleconverters have been around for a long time and continue to be available because they’re ...

Photo Review Tech Editor Margaret Brown looks into the benefits and consequences of using focal length extenders. Teleconverters are popular with birders because they provide an affordable ““ and ...

Judging from the technical questions we get from readers, there is a lot of misinformation about teleconverters floating around the internet (no surprise). Here are some answers to those questions… ...