AmScope SM05 0.5X Barlow Lens For SM Series Stereo Microscopes (48mm)
This is a brand new 0.5X Barlow (auxiliary objective) lens for stereo microscopes. It doubles the working distance and field of view of your microscope and cuts magnification power by half. This lens comes with a 1-7/8" (48mm) mounting thread and goes with SM and SW series stereo microscopes. Its retail value is $180.