Opto Engineering® - 20 years
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TCEL series
0.243 - 3.5 x
Focus tunable

Key advantages

  • Extended depth of field
    Thanks to the integration of Optotune liquid lenses it is possible to significantly extend the DOF of telecentric optics
  • Excellent optical performances
    The optical design of the lenses allows to obtain very low distortion and superior optical performances
  • Precise and quick autofocus
    Electronically driven liquid lenses allow for extremely fast and precise changes of focus
  • Detailed test report with measured optical parameters
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Don’t worry! We can integrate liquid lenses with many other models including those with coaxial illumination. Feel free to contact our Sales Engineers to check the feasibility.

Application example

Instead of using a larger lens (left) and a higher resolution camera to compensate for it, with the TCEL series (right) it is possible to extend the DOF of a lens that is properly dimensioned for the sample.

Both the driving current and the magnification are linearly proportional to the working distance, allowing the system to be calibrated to compensate for the inevitable variations in magnification due to the liquid lens (by way of example, the graphs relating to the TCEL23036 lens are shown).

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Last update 20 Oct 2023

Expand table


  1. Field of views are calculated at 0 dpt power of the liquid lens.
  2. Working distance (nominal): distance between the front end of the mechanics and the object at 0 pdt power of the liquid lens.
  3. Minimum and maximum working distance are reported at nominal range of the liquid lens; maximum excursion may be larger.
  4. Working f-number (wf/N): the real f-number of a lens in operating conditions.
  5. Maximum angle between chief rays and optical axis on the object side, evaluated at 0 dpt power of the liquid lens. Typical (average production) values and maximum (guaranteed) values are listed.
  6. Maximum values calculated in the range -2 to +3 dpt of the liquid lens.
  7. Percent deviation of the real image compared to an ideal, undistorted image, , evaluated at 0 dpt power of the liquid lens. Typical (average production) values and maximum (guaranteed) values are listed.
  8. At the limits of the depth of field, the image can still be used for measurements. For a very sharp image, however, only half of the depth of field should be considered. Pixel size used for calculation is 3.45 μm.
  9. Object side, calculated with the Rayleigh criterion with λ= 520 nm
  10. Typical at 30°C, 0 to ±250 mA step.
  11. Indicates the availability of an integrated camera phase adjustment feature.
  12. Measured from the front end of the mechanics to the camera flange.

Additional notes

  1. Performances calculated with monochromatic light (LED emission); performance range in white light is smaller.
  2. Performances guaranteed when used with vertical optical axis; when used with horizontal optical axis performances drop due to gravity induced aberrations of the liquid lens.

Ordering information

Hirose cables and liquid lens controller sold separately.
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Technical documents

Product user guide
Back focal adjustment