Outside dia. 49.5mm, thread M48x0.75mm, with two slots for holding annular ring light, for SZ Series..
Class with a thread for SZ Ring Adapter and Auxiliary Lens
Outside dia. 60mm, thread M55x0.7mm, for SZ2 Series Stereo Zoom Microscope..
Outside dia. 49.5mm, thread M55x0.7mm, with glass, for SZ2 Series Stereo Zoom Microscope..