Machine Vision Lenses and Optics - STEMMER IMAGING


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Sill Optics tunable telecentric lenses

Telecentric lenses with a tunable working distance

Thanks to a cooperation between Sill and Optotune, you can dynamically adjust the working distance of telecentric lenses at a rate of up to 40 times per second.

The working distance on the configurations is linearly proportional to the dioptic power. Due to the influence of the focal length, the magnification is not constant. However, with some calibration adjustments, this small difference can be corrected for consistent accuracy (by adjusting it for the linear behaviour). Due to the telecentricity condition, the aperture of the system can be projected to infinity on the telecentric side.

In an optic side telecetric lens the tunable lens needs to be mounted behind the aperture of the lens (in front of the camera sensor) - please note that this configuration does not allow for the possibility of a bi-telecentric solution.


  • Sensor size: 1/2" to 35 mm line scan sensor
  • Magnifications: 0.133x to 3.0x
  • Working distance: Between 79.7 mm and 434.1 mm
  • Lens mount: C-mount and M42x1 with 40mm BFD
  • Distortion: Max. 0.2% to 0.8%
  • Wavelength: 450-680 nm
  • Clear aperture: 26mm to 153 mm
  • Length: 133.4 mm to 587 mm
  • Optotune lens EL-C-16-40-TC: optical power through the Optotune lens -2.0 to +3.0 dpt / control current  -250 to +250mA / power consumption 0 to 0.7 W

Show products

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Model Camera mount (optics) Max. sensor size (mm) Manufacturer Magnification (max) Working distance (mm)
SILL TZM 0420/3,0/EL-16-40-M42 M42 x 1 35.0 Sill Optics 3.0 97.4
SILL TZM 0422/2,0/EL-16-40-C C-mount 1" Sill Optics 2.0 106.2
SILL TZM 0422/2,0/EL-16-40-M42 M42 x 1 Sill Optics 2.0 106.2
SILL TZM 0426/2,5/EL-16-40-M42 M42 x 1 35.0 Sill Optics 2.5 100.9
SILL TZM 0625/1,0/EL-16-40-C C-mount 1" Sill Optics 1.0 189.8
SILL TZM 0627/1,5/EL-16-40-C C-mount 1.25" Sill Optics 1.5 164.7
SILL TZM 1260/0,311/EL-16-40-C C-mount 1" Sill Optics 0.311 190.0
SILL TZM 1560/0,659/EL-16-40-C C-mount 1/2" Sill Optics 0.659 87.0
SILL TZM 1565/0,193/EL-16-40-C C-mount 1" Sill Optics 0.193 284.0
SILL TZM 1860/0,133/EL-16-40-C C-mount 1" Sill Optics 0.133 300.0
SILL TZM 2060/0,499/EL-16-40-C C-mount 1/2" Sill Optics 0.499 117.0
SILL TZM 2660/0,374/EL-16-40-C C-mount 2/3" Sill Optics 0.374 158.0
SILL TZM 2898/0,578/EL-16-40-C C-mount 1" Sill Optics 0.578 92.0
SILL TZM 3060/0,343/EL-16-40-C C-mount 1/1.8" Sill Optics 0.343 165.0
SILL TZM 5060/0,192/EL-16-40-C C-mount 2/3" Sill Optics 0.192 309.0
SILL TZM 6060/0,289/EL-16-40-C C-mount 1" Sill Optics 0.289 180.0