AstroScope 9350NIKS-3PRO is specifically designed for Nikon SLR cameras and mounts between the camera body and Nikon AF-type lenses using the standard Nikon bayonet. AstroScope incorporates a high quality optic designed specifically for today’s digital SLR cameras and delivers bright, tack-sharp full frame images with little or no vignetting. It's rugged epoxy-coated aluminum chassis withstands harsh field conditions and seamlessly integrates with your camera’s body. No additional batteries or field adjustments are required, because AstroScope is powered directly from your SLR camera and maintains all communication signals between the camera body and lens. REad the full article here