The Bower's 2x DGII Teleconverter (7 Element) for Sony will effectively double the focal length of your Sony lens, while maintaining the autofocus function - a 35 mm lens becomes a 70 mm lens. This 7-element teleconverter uses multi-coated optics to deliver improved image quality. With an 85 mm f/1.4 lens, for example, the focal length will become 170 mm, which effectively sets the maximum aperture at f/2.8 (cutting the amount of light captured by two f/stops). This teleconverter is a portable, high-quality and versatile accessory that's well worth having in your camera bag. It's only compatible with lenses with a maximum aperture greater than f/4.0 in order to fully utilize its autofocus capabilities.
Reviewed by 1 customers
I bought this teleconverter for the purpose of using it with my 70-300mm lens. It does the job as intended. It will not auto focus with this lens, but I am not using this for action shots. The price is reasonable and it does the job. I have not used it enough to find any flaws with it. I might add that it does auto focus with my 50mm 1.8 lens.