SV241 Pro has 3-Axis precise adjustment. Precisely adjust X,Y,Z three axes. It is compatible with most mobile phones. Z axis adjustment helps get the correct eye relief to capture the clear images and videos of celestral objects with your smartphone like never before. This mobile phone holder can be used for telescopes with an outer diameter range of 28-48mm. The SV214 Pro 3-axis universal smartphone adapter is compatible with almost any brand/model of iPhone/Android smartphone (width 55mm-105mm). Made of rigid aluminum alloy, doesn't bend, tilt or warp, holds your cellphone tight and perpendicular to the telescope eyepiece. EVA pads on eyepiece clip and phone clip protect equipment from wear and tear. 1.25 inch phone adapter suitable for 1.25"small eyepieces, 2 inch phone adapter applicable to large eyepiece. The digiscoping adapter can compatible with many telescope, like binoculars, microscopes, monocular telescope. Adjust the eyepiece clip and mobile phone clip to the appropriate position. You can use this mobile phone holder for astronomical observation and animal watching. SV188P star diagonal dielectric coatings; super flat mirror with dielectric coatings to reduce reflected light loss; provide an over 99% reflective surface; good for astronomical viewing SV188P star diagonal 90 degree viewing angle; diagonal reflects the telescope's light path 90 degree to provide a more comfortable viewing angle; best for observing objects overhead SV188P star diagonal brass compression ring; Built in brass ring and thumbscrew accessories avoid eyepiece to rotate during adjustments; effortless fixes more firmly and will not scratch your eyepieces barrels.