[42T⇒50.8AD]
[60⇒50.8AD]
[36.4⇒31.7AD]
[42T⇒31.7ADSX]
[50.8⇒43AD]
Screw diameter conversion adapter.
Adapter converts eyepiece diameterAllows you to use eyepieces with different size from the eyepiece diameter of your astroscope.