Start with the light
Which Optical Filter Do I Need?
A practical route from the light you want to keep to the filter family to explore.
Read the guide →KUPO Optics · Optical filters & coatings
Shape the light.
See what matters.
Find a filter for the wavelengths you need, or work with us on a coating designed around your optical system.
Since 1992Optical manufacturing
2,000 m²Cleanroom production
Standard + customFilters and coatings
Choose with confidence
A little clarity.
A better filter choice.
Start with the question you are working through. These guides connect optical principles to practical product choices.
Understand the curve
How to Read a Transmission Chart
Find the useful band, inspect unwanted transmission and understand what the measurements mean.
Read the guide →Match your system
Choosing a Filter for Your LED and Camera
Bring source bandwidth, detector response and working angle into the same decision.
Read the guide →Explore the catalog
What should your
filter do?
In-House Process
From Substrate to Verified Filter
Cleaning
Substrate preparation removes particles and residue before coating begins.
Watch the process ↗
Coating
Ion-assisted deposition with planetary rotation builds dense, uniform optical coatings.
Watch the process ↗
Cutting
Linear and laser cutting supports standard and custom shapes up to 42.5 × 45 cm.
Watch the process ↗
Spectrometer Inspection
Filters are scanned against specification before stocking and again before shipment.
Watch the process ↗
Surface Check
Dedicated inspection tools identify cosmetic and handling defects before shipment.
Watch the process ↗
Inside the Cleanroom
A look inside the cleanroom where prepared substrates become verified filters.
Watch the process ↗Let’s work through it together
Your system comes first.
You do not need a finished specification to start. Tell us about your light source, detector and the wavelengths you want to pass or block.