High-performance aspherical condenser lens, Further reduction provided by utilizing distinct parallel observational & illuminating light beams. Ergonomic one-finger control of all functions. Synthetic rubber brow rest. Dust proof. Magnified, illuminated aperture viewing window. Universal bayonet mount, anti-theft locking feature. 29 lenses and 24 aperture filters.   #5412L-Each Latex Free UNSPSC#42182005