This Lens Holder supports a lens with three equally spaced posts on a 58mm circle. Lenses having diameters from 10 to 50mm can be centered in the optical path. The posts, which are held in place with individual thumbscrews, have V grooves at their ends to hold the edges of unmounted lenses. The ring is pin-mounted so that its height above the optic axis can be varied. It can be mounted in the collar of the EO-01 and EO-02 Bench Carriers.