ML-20-37 Manually Tunable Liquid Lenses ML-20-37-VIS-36D-C
ML-20-37 is a mechanically tunable lens with a 20 mm clear aperture and optical power from –18 to +18 dpt. Turning the outer ring manually varies curvature continuously from concave through flat to convex. A durable low-torque mechanism provides long life and easy motorization for precise, repeatable focus control. Optional C-mount supports imaging and optical systems; a compact version integrates into OEM systems with four screws. Aperture, thickness, and adjustment range are customizable. Applications include ophthalmic instruments such as refractive correction in refractometers, variable beam expanders, illumination, education, and research. Temperature drift: to be determined (Dpt/°C). Standard product overview： Model | Optical power adjustment range（dpt） | Cover glass coating（nm） | C-mount | Wavefront error* ML-20-37-VIS-36D | -18-+18 | 400–700 | - | <0.19/0.95 ML-20-37-VIS-36D-C | -18-+18 | 400–700 | Yes | <0.19/0.95 *Wavefront errorexpressed in λ RMS, measured at 525 nm (at 0 dpt / over the adjustment range)。
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Overview
Specifications
| Parameter | Value |
|---|---|
| Clear Aperture | 20mm |
| Outer Diameter | 37mm (39mm including gear) |
| Thickness | 13.2mm (without adapter), 18.6mm (with adapter) |
| Weight | 13.7 g (without adapter), 25.2 g (with adapter) |
| Maximum Torque [At the gear] | 80mNm (at the gear) |
| Full Adjustment Angle | 337° |
| Lens Type | From plano-convex to plano-concave |
| Optical Zoom Range | -18-+18dpt |
| Focal Adjustment Range | -55mm to infinity, then to +55 mm |
| Focal Length Resolution | Depends on the motorization implementation |
| Optical power change per degree of rotation | 0.12dpt/° |
| Optical Liquid Refractive Index [20°C] | 1.38 |
| Abbe Number | 65 |
| Wavefront Error [Over the adjustment range; 525 nm, 5 mm clear aperture; RMS] | 0.95 λ RMS |
| Wavefront Error [0 dpt；525 nm，5 mm Clear Aperture ；RMS] | 0.19 λ RMS |
| Polarization | Hold |
| Operating Temperature | 10-40°C |
| Storage Temperature | -20-+75°C |
| Humidity [Noncondensing] | 30-50% R.H. (noncondensing) |
| Lifetime | 5 million cycles |
Key Features
Datasheet
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