The question arose the other day in a scan of the microscope forums on Yahoo. The user wanted to know if he could use his rather expensive Olympus 100x Oil Objective on a Nikon microscope.
The nosepiece thread pattern for Nikon Eclipse series microscopes is 25mm. (with the exception of the Nikon Eclipse 100 LED which is the standard RMS threading of 20mm)
The thread pattern for Olympus Infinity objectives is 20mm RMS. There in lies the problem.
SEO Enterprises, Inc Microscope Sales and Service is now making available a step down adapter that reduces the thread size of the 25mm Nikon to the 20mm thread pattern of most microscopes, including Olympus, Meiji, and Accuscope.
The Nikon Adapter is available on their website.