The swarovski 25 50x w eyepiece is designed for use with the swarovski atmstm atssts and cts series of spotting scopes providing wide angle viewing throughout the whole zoom range the swarovski optik 25 50x w eyepiece offers improved observation comfort and is an ideal lens for digiscoping as it is compatible with all of swarovskis existing photo adapters the magnification range covers all of the most useful settings for birdwatching and the spherical lens optical system gives edge to edg