0.7X Barlow lens for SM series stereo microscopes, extending working distance and field view of the microscope and cutting magnification power by 0.7 times. Mounting size: 1-7/8" (48mm) in diameter.
This lens uses a 48mm (1-7/8") mounting thread and goes with most stereo microscopes.
0.5X is a condensing glass with a working distance of 165mm.Increase the working distance, reduce the multiple, the multiple after use is *0.5Auxiliar..