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liquid focus lenses

Our lenses for universal applications


Key features of the Lenses

  • Focus tunable liquid lens included
  • Large working distance range
  • Fast focus within milliseconds
  • Large image circle
PYRITE Liquid focus lens F4.0 60mm C-Mount

Our Pyrite - LIQUID FOCUS lensES

These lenses are combining an approved Schneider-Kreuznach lens and one of Optotunes Focus Tunable Lenses EL-16-40-TC-5D. They come in two versions for C-Mount and TFL-Mount. To achieve a wide range of working distance the lenses can be combined with extension tubes of 5 mm, 7 mm, 8 mm or 10 mm so the liquid lens can always be used in its optimal operating range.

Working principle with extension tubes
In delivery condition the lens has its optimal working distance starting from infinity. To reach closer distances it is necessary to use an extension tube between lens and camera, so that the liquid lens element can always be used in its comfort zone for focussing. The ranges recommended in the table can additionally be extended in both directions by applying a higher operating current as the imaging power decreases.

Extension tube PYRITE LF F4.0/60 mm PYRITE LF F4.0/80 mm
  Working distance range Magnification range Working distance range Magnification range
None Infinity - 650 mm 0x - 0.09x Infinity - 750 mm 0x - 0.1x
5 mm 870 mm - 340 mm 0.07x - 0.18x 2150 mm - 620 mm 0.04x - 0.13x
7 mm 640 mm - 290 mm 0.10x - 0.22x 1430 mm - 400 mm 0.07x - 0.20x
8 mm 565 mm - 270 mm 0.12x - 0.23x 1210 mm - 375 mm 0.08x - 0.21x
10 mm 465 mm - 250 mm 0.16x - 0.27x 950 mm - 335 mm 0.10x - 0.24x
15 mm 330 mm - 220 mm 0.23x - 0.33x 630 mm - 300 mm 0.16x - 0.29x
20 mm 260 mm - 180 mm 0.31x - 0.41x 480 mm - 280 mm 0.21x - 0.33x
25 mm 220 mm - 160 mm 0.39x - 0.50x 395 mm - 270 mm 0.27x - 0.36x
30 mm 190 mm - 140 mm 0.47x - 0.58x 340 mm - 255 mm 0.33x - 0.41x

Further information on the liquid lens element can be found on the Optotune Switzerland AG website (external links):
Product page liquid lens  I  Datasheet liquid lens  I  ​​​​​Product page controller  I  Manual controller  I  Software download

Discover the compatibility of PYRITE LF lenses with top sensor brands
Check out the optimal sensor compatibility for PYRITE LF lenses. Our selection includes a variety of compatible sensors from leading manufacturers such as Sony, OnSemi, GPixel, ams. Improve your imaging efficiency and accuracy with the ideal lens-sensor combination.




FAQ – Frequently asked questions

What is delivered with the lens?

Included in delivery is the PYRITE lens with integrated liquid lens element. You will need additional accessories (controller, connection cable and software) to operate the lens.

What are the requirements for components and software?


What components and software are needed to use the lens?
Controller: lens driver 4i

Cable to connect controller and liquid focus lens: electrical lens connection cable 6-pin Hirose male to 6-pin Hirose female connector

Software to drive the focus tunable lens: link


Set up of components?

Connect the controller to your PC directly or use an USB extension cable.

Connect the controller to the focus tunable lens with the Hirose cable.

Download the software to set up and drive your liquid lens.

Where can I buy the components? Is there a technical support?


Where to buy the components?
For purchase and more information please contact:
1105910 – CAB-6-100 - electrical lens connection cable

1105911 – EL-E-4I - USB current driver for electrically tunable lens

Who to contact if I have problems with the setup or operating?
Schneider-Kreuznach technical support at:


f' (mm)
Sensor Size
Size D x L (mm x mm) *+23 mm connector of liquid lens
Weight (g)
Filter thread
Request quote

Mounts for PYRITE LF lenses


A C-mount is a specific mechanical connection widely used in the industry for cameras and lenses. It is defined by a diameter of 1 inch (25.4 mm) and 32 threads per inch (C-mount thread). This mount allows lenses to be easily and securely attached to cameras and is widely used in machine vision and other applications.

C-mount connectors provide a robust and proven solution for connecting lenses to cameras. The standardization of C-mount also makes it easy to change lenses to meet the changing needs of different applications.


A TFL-Mount is a specific mechanical mount used in the industry for cameras and lenses. The term "TFL" stands for "Treaded Filter Lens" and describes the thread system used with this mount. TFL-Mounts are also known as "M30.5x0.5" because they have a thread with a diameter of 30.5 mm and a pitch of 0.5 mm.

The technical characteristics of the TFL-Mount are based on this standardized thread and diameter, which allows high compatibility between different lenses and cameras. This mount is widely used in industrial vision systems and other applications where precision and consistency are important.


Product features

Product sheet PDF


Download the PYRITE LF lens product sheet for details of the lens family. It provides a comprehensive overview of the features, specifications and capabilities of each lens in the family.


Environmental Facts of the PYRITE LF lenses

Our PYRITE liquid focus lenses are tested to DIN standards to ensure they meet stringent environmental requirements. These tests check the durability of the liquid focus lenses, their resistance to temperature changes and their ability to withstand shock tests and sinusoidal vibration. This ensures that the industrial lenses are up to the task in demanding industrial applications such as barcode reading or parcel sorting, providing consistent performance and reliability over time.

Slow temperature cycling

-25°C - +70°C
5 cycles a 12h

DIN ISO 9022-2-14-03 -1
Damp heat, cyclic

-23°C - +40°C
80% - 95% rel. humidity

DIN ISO 9022-2-16-01-1
Shock testing

50 g / 11 ms
18 shocks

DIN ISO 9022-3-30-06-1

Sinusoidal vibration

2 g
10-500 Hz

DIN ISO 9022-3-36-04-1

optical filters

By protecting the lens, eliminating unwanted wavelengths and enhancing contrast, optical filters can improve the image quality of your lens in industrial applications.



Maximise the potential of your industrial lens with our range of high quality accessories including camera adapters, extension tubes, filter holders and UNIFOC.

Overview of all Schneider-Kreuznach Products

Download our Product Brochure (PDF)

The interactive eBrochure includes all standard Industrial Lenses and Industrial Optical Filters currently available from Schneider-Kreuznach. 
Find all the important information about our products in one place. Search, compare and find the right solution for your needs. DOWNLOAD




Check out our range of C-Mount or TFL-Mount compact lenses. They're compact, robust and available in ruggedized, stabilized or motorized versions. Ideal for demanding applications like automated optical inspection, 3D measurement and machine vision in industrial environments.


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+49 (0) 671 601 0



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