This set of compression rings allows small eyepieces such as those found on microscopes and telescopes to use any of the Novagrade Digiscoping adapters.
 
For eyepieces smaller than 39mm in diameter the Small Compression Ring Set will provide a perfect fit.  Whether for your microscope, telescope or small binoculars the injection molded polymer rings will grip your eyepiece securely.  Compression Rings work with ANY Novagrade Adapter.