Opteka 3.3x High Definition II Telephoto Lens Converter for Pentax K7, KX, K1000, K2000, K10D, K100D, K20D, K200D, & *ist Digital SLR Cameras

A 3.3x converter will triple your camera's maximum focal length, bringing things three times as close.High-index / low-dispersion optical glass, Digital Multi-Coated, Titanium anodized finishHigh speed auto-focus / Infrared compatibleMaximize day and night shots by providing maximum light and image transmissionLens bag and lens covers included
Product DescriptionSince it fits right over your camera's existing lens system, a telephoto converter affects the zoom range of your camera's lens. A

Source: Digital Camera and Video Store...