Microscope Eyepiece Adapter from 30.0mm to 23.2mm
Eyepiece Adapter for Microscopes, outer diameter 30.0mm and inner diameter 23.3mm (to allow 23.2mm eyepieces
Length of nosepiece: 24.6mm
Diameter of nosepice: 30.0mm
Optical length: that's a good question... 5.6mm is the thickness of that obstructing part on the outside that goes around, but there is also a 5.8mm deepening inside that will most likely let the eyepiece go deeper...
(The picture shows the exact model that we have)
Overall length: 30.3mm