BLUE Vision - Blue Light for Machine Vision

Practically double the resolution of conventional imaging

With the new BLUE Vision lenses, Vision & Control now provides telecentric measuring lenses whose colour correction has been extended far into the blue range.

For your depth-extended and/or finely structured measurement objects, our telecentric objectives of the BLUE Vision series in combination with the matching blue luminous vicolux® lighting offer maximum resolution with maximum depth of field for imaging your measurement object!


Advantages and applications


The use of blue light enables maximum resolution. The diffraction blur is low.


Red or infrared illumination causes blurring due to strong diffraction.


With blue lighting, the lens can be stopped down sharply without blurring. The depth of field is thus large.  


In the red spectral range, the aperture must be opened further, the depth of field decreases.

Properties of the BLUE Vision components from Vision & Control

Leading image processors rely on our components



In our extensive portfolio of combinable products for machine vision specialists, you will find a large selection of telecentric BLUE Vision lenses and matching blue LED lighting.



Frequently asked questions

In industrial image processing, optical imaging is expected to provide high image sharpness with the greatest possible depth of field at the same time. 
However, these are two parameters that are partly mutually exclusive and often require compromises. If the lens is stopped down to achieve the necessary depth of field, the image becomes increasingly blurred due to diffraction. 


The depth of field (colloquially also depth of field) of a lens depends only on its magnification and the aperture set. Small image scales and large f-numbers mean large depth of field, small f-numbers result in high resolution. Therefore:

  • Do I need a large depth of field → small sensor with a small magnification?
  • Do I need high resolution with a flat object → large sensor with large magnification ratio

With blue light, the highest resolution is achieved in the visible spectral range. The aperture can be reduced by one f-stop for the same resolution as in the infrared spectral range, doubling the depth of field.




Within the visible spectrum, monochromatic image examinations with blue light are most effective. The lenses of our vicotar® BLUE Vision series are specially designed for this spectral range. - Here they deliver maximum resolution with the greatest possible depth of field.



Resolution and depth of field are two optical parameters that work against each other. The more a lens is stopped down, the more blurred its image becomes due to the increasing diffraction and consequently the less details can be resolved. Industrial image processing, however, demands both: maximum resolution with the greatest possible depth of field. The newly developed lens series "BLUE Vision" takes this demand into account. It takes advantage of the fact that the smaller the wavelength of the light used, the smaller the diffraction effects. This is reflected in the resolution in the opposite way: If the wavelength is halved, the resolution is doubled.


For example, if a lens at f-number 10 produces a diffraction disc of 8 micrometres radius with red light (650nm), then with blue light (450nm) it is only 5.5 micrometres, so the blur is almost a third less, which corresponds to the ratio of the wavelengths.

In addition to the fact that blue light enables much more precise image examinations, another argument in favour of using this light colour is that these light-emitting diodes have the highest efficiency compared to LEDs in other spectral ranges. They reach values of up to 70%. In contrast, the efficiency of green LEDs is only about 20%. Red LEDs are in the range of 40%. Thus, inspection with blue light is accompanied by reduced energy consumption. This is reflected, for example, in shorter exposure times or lower heat generation.

vicolux® illuminators from Vision & Control are designed for these short wavelengths of 450 nm and offer good illumination even under difficult conditions due to their large power reserve (both in continuous light and flash mode). 


Modern camera sensors have the maximum sensitivity in the green spectral range, it drops somewhat in the red as well as in the blue range. Our picture shows the quantum efficiency of the frequently used Sony sensor IMX304 as an example.



You can see that the sensitivity to blue light is at least equal to the red sensitivity.

The resolution of a microscope depends on the wavelength λ and the numerical aperture A of the objective.  


It is calculated as 0.61 λ / A. Conventional microscope objectives are available up to an aperture of 0.65, resulting in a resolution of approx. 400 nm for blue light. The maximum resolution thus corresponds approximately to the wavelength used.

Electron microscope (0.1 nm - theoretically even up to approx. 0.004 nm)

vicotar® BLUE Vision lenses are currently available for the common sensor formats from 1/3" to 1.2"(4/3").

Vision & Control is a manufacturer and developer of components for industrial image processing, therefore it is possible for us to develop lenses specifically for your applications in your series machine and to supply them reliably in the long term.


The BLUE Vision lens series are perfectly matched to the overall portfolio of Vision & Control GmbH. 
Lens holders, optical colour filters, UV blocking filters, tuning rings and deflection mirrors are available as accessories. 
Depending on the application, BLUE Vision lenses can be combined with telecentric illuminators, ring lights, area lights or single-mirror illuminators.


We look forward to your enquiry

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