Extend the reach of your zoom without exposure loss. The 1.6X Tele- Converter is a front mounted accessory that also provides greater telephoto reach. Use it to instantly shift the focal length range of your camera in the telephoto direction by a magnification of 1.6X. The perfect tool when it's inconvenient, dangerous or impossible to move as close to the subject as you would like. Note that the Tele-Converter offers partial zooming, vignetting will start to occur very quickly at approximately 20% after you start to zoom towards the wide angle direction and increase through the zoom back producing a port hole effect at the full wide angle position. To protect the front glass, the face of the unit offers 102mm threads for direct attachment of a 102mm Clear Filter or 102mm Linear True-Pol.