The Good, the Bad, & the Beautiful - Using Teleconverters & Extenders The Benefits, Disadvantages, & Considerations of Using Teleconverters/Focal Length Extenders with your Lenses. Read More For Photographers, Camera Gear, Original ArticleDan ZeeffMarch 10, 2020teleconverter, extender, extenders, teleconverters, lenses, zoom, telephoto, magnification, 1.4x, 2x, canon, nikon, sony, pros, cons, benefits, disadvantages, nofeature