Product Features Description The Digital Concepts 2x teleconverter (also known as a tele-extender) will multiply the focal length of the existing lens by 2x, and will cut back the amount of light by 2 f/stops. This precision optical accessory, which is compatible with your Nikon SLR camera, allows you to increase the focal length of your lens without sacrificing optical quality. For example, using a 2x teleconverter with a 300mm lens will effectively increase the focal length to 600mm. A lens set to f/2.8 will now be f/5.6. It also reduce depth of field to the 50% of the master lens. more info

Canon is an industry leader in professional and consumer imaging equipment and information systems. Canon's extensive product line enables businesses and consumers worldwide to capture, store and distribute visual information. Canon provides a wide range of accessories that are fully tested and 100% compliant with the corresponding equipment. All accessories are noted for their high reliability and superior quality.The Tele-Converter TC-DC52 converts the focal distance of the body lens by a factor of approximately 2.4 (35mm film equivalent at maximum telephoto: approximately 252mm) when attached. It requires Lens Adapter LA-DC52 for use with PowerShot A10 and A20 and Lens Adapter LA-DC52B for use with PowerShot A30 and A40. more info

The TC-DC58N Tele-converter converts the focal distance of the body lens by a factor of 0.7 when attached. more info