Edmund Optics® (EO) (Barrington, NJ.) offers two liquid-filled lenses from Optotune of Switzerland. The Electrically Focus-Tunable Lenses provide a single-lens tool for focus and zoom objectives. When the user applies a voltage to each plano-convex lens, the lens changes focal length. Each lens is filled with a proprietary optical liquid, and the change in voltage alters the pressure profile of the liquid, resulting in a change in radius of curvature. This electrical manipulation of the radius allows for a focal range of +15 to +100 mm and an aperture of 10 mm. The lenses are available in high refractive index or low dispersion options. Cover glasses for the Electrically Focus-Tunable Lenses are available with either a VIS or NIR coating.
Manually Focus-Tunable Lenses use a rotating outer ring to manipulate their focus length and change the shape of the lens from convex to concave. They also offer a wide focal tuning range of -40 mm to infinity to +40 mm. The lenses, which are available in high refractive or low dispersion options, have an aperture diameter of 20 mm. Cover glasses are available with a VIS coating.
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