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MidOpt filters
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White light balancing Filter

Corrects artificial white lighting so colours appear more natural. LA series (amber) reduce blue shading often strongly dominant in white LED, Xenon strobe and metal halide lighting. LB series (blue) reduce the red in tungsten and halogen lighting. FL series fluorescent lighting filters and other wavelength enhancing filters are available.

• LB080 – Minus Red – removes yellow cast from halogen lighting
 


LA120 Light Balancing Filter (minus Blue+)
Model
Transmission
Features
Suitable for
LA120
Passes 500nm+
Absorbs UV and blue 200-500nm
Reduces 400-500nm
• Single substrate, hard-coated filters
• Cost-effective solution
• Use with white 6500ºK LEDs
• Obtaining accurate colour rendition


These single substrate, hard-coated filters to be preferred for use with white LED lighting when accurate colour rendering is desired. White LEDs typically have a steep blue "spike" that results in a strong overall bluish cast to the subject being illuminated. Not only can this be disconcerting, poor color rendition may result in difficulties in some color inspection applications.

While there currently are “warm white” LED lighting options available, they are significantly more expensive, have significantly lower output, a shorter lifetime, and often a slight bluish tint still remains. Using only an LA120 filter over the camera lens with standard, less expensive white LEDs works just as well and is far more cost effective.

This same benefit can be seen when using an LA120 filter in subjects illuminated with some metal halide and mercury lighting as well


(Left) 6500ºK LEDs put out a lot of blue.
(Right) LA120 limits the blue cast for accurate hue and brightness

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LB080 Light Balancing Filter – Minus Red – removes yellow cast from halogen lighting
Model
Transmission
Features
Suitable for
LB080
Passes 370-520nm
Absorbs 360nm and below; 540-1100nm
• Raises the lower colour temperature associated with lighting with a higher percentage of red component to give a more natural-looking colour • Applications using fibre-optic lighting


Single substrate, hard-coated LB080 filters are used to raise the lower colour temperature associated with lighting with a higher percentage of red component, in order to create more natural looking colour. Its name is derived from the mired shift value; approximately -80 mired.

These filters are often used in association with fibre optic lighting and are sometimes referred to as "blue" filters because of their bluish colour.



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FL550 Light Balancing Filter – Minus Green – removes green cast from fluorescent
Model
Transmission
Features
Suitable for
FL550
Passes 400nm and above
Absorbs 390nm and below
• Absorbs somewhat in the middle of the visible portion of the spectrum
• Improves colour rendition due to the above
• Eliminating the strong greenish colour that results when white fluorescent lighting is used for illumination


This pinkish-coloured, single substrate, hard-coated filter is used to eliminate the strong greenish color that results when white fluorescent lighting is used for illumination. It absorbs somewhat in the middle of the visible portion of the spectrum, which is also where some colour cameras have their strongest visible response, resulting in improved colour rendition.

 

 

 

 

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