Sony SEL55210 55-210mm F4.5-6.3 2.2x High Definition Super Telephoto Lens (This Lens Mounts On Top Of The Sony SEL55210 55-210mm F4.5-6.3 lens, Includes Ring) 2.2x High Definition Telephoto Lens designed to mount atop traditional SLR lenses. Optimized For Mega Pixel Photography. High Definition Digital Lens (3 Groups/3 Elements). MultiCoated Optical Glass Uses 72mm Filters. Extreme Speed Auto Focus yields crisp and clear images.