The MeoPix iScoping adapter is a revolutionary new tool for anyone wanting to capture long range images. The MeoPix iScoping adapter slips over the spotting scope or binocular eyepiece - cradling your iPhone 4/4s in perfect alignment to the optic - allowing your iPhone to capture amazing long distance images. Fits 42mm eyepiece. Works with: Swarovski EL, Zeiss Victory, Zeiss HT, Zeiss Conquest, Vortex Razor, Vortex Viper, All 42mm Leica, Nikon Monarch 3,5,7, Meopta Meostar.