Focal length;0.16" 4mm;offer high magnifications;look more closely and more detailed at the moon's surface and other planet; for viewing the moon and planets
52 to 100mm has been tested compatible with iphone;iphone 5;5s;6;6 plus;7;7plus;Sony;Sony Xperia Z;Samsung Note;Samsung Galaxy S7;Galaxy 7;Galaxy 5;Galaxy Note 5;Samsung Note 4;ECT;Moto G5+ and many other brands
Standard 1.25'' 31.75mm fitting diameter;can be used in any astronomical telescope with a 1.25" focuser;for broad field lunar observations; medium sized star clusters;and a wide range of cloudy nebulas and deep sky targets
Fits eyepiece diameter from 25 to 48mm and 1.25" telescope;not fit 2" eyepieces;compatible with microscope;telescope;binoculars;monocular;spotting scope;night vision monocular and most optical device
Fully coated optics glass eyepieces for excellent image contrast and light transmission;give maximum detail and definition across the entire field of view;highly achromatic;planetary filters enhance details on Jupiter;Saturn;Mars and Venus