Electrically Focus Variable Lens EL-10-30

Compact optics and short setting time: EL-10-30 allows for that due to its electrically tunable focal range. Within 10 ms, the radius of this plano-convex lens can be changed by applying a voltage between 0 and 5 V. The lens can be operated with commercial power supplies allowing for current control. Power consumption is less than 2 W. For each lens a test chart displaying the dependendency between focal length and current can be provided.

The EL-10-30 comes in two different housings: Compact and C-mount. While the compact housing is preferably mounted in a 30 mm ring, the C-mount housing has threads on either side. Furthermore, the C-mount version accommodates space to insert an offset lens of 12 or 12.7mm diameter. The working principle of both versions is identical. C-mount versions marked with a "C" in the name.

In the download area, a DLL is provided for embedding the lens in ZEMAX.


• Aperture 10 mm
• Lifecycles (10-90% sinusoidal): >1.000.000.000
• Response time (10%-90% step): < 2.5 ms
• Settling time < 15 ms
• Polarization preserving
• Transmission > 90 % @ 633 nm
• AR coated for 400-700 nm or 700-1100 nm
• Abbe number: 31 (HR)and 100 (LD)
• HR: n_F (486.1 nm) = 1.572, n_D (589.3 nm) ​= 1.559, n_C (656.3 nm) = 1.554
• LD: n_F (486.1 nm) = 1.302, n_D (589.3 nm) ​= 1.300, n_C (656.3 nm) = 1.299
• Damage threshold 10 kW/cm² (@1064 nm)