Choosing a Standard Filter or Requesting a Custom Design: What to Send KUPO
You do not need a finished drawing to start. Share the application first, then work toward an agreed optical and mechanical specification.
Optical Filter Guides
A useful filter choice starts with understanding the light you want to keep. These practical guides help you read the curves, compare filter types and work through the details of your application.
Not sure where to begin?
Start with the selection guide, then learn what the transmission chart can tell you.
Find your filter type →Learn to read a chart →Explore the guides
Can I Stack Optical Filters? How to Check Transmission, Reflections and Focus
Combining filters can be useful, but each added element changes the light path. Work through the spectrum and the imaging consequences.
Optical Density and Blocking Range: What Do You Actually Need to Specify?
An OD number needs a wavelength range and measurement conditions. Learn how to turn “block the background” into a useful requirement.
Why Does My Filter Change When I Tilt It?
The holder angle is only part of the story. Learn why a lens can expose a filter to many angles at once.
CTO, CTB or Minus-Green: Which Color Correction Does Your Light Need?
Separate warmth and coolness from green tint, then evaluate the correction with your actual light source.
IR-Cut, UV-Cut or UV/IR-Cut: Choosing a Filter for Your Camera
Decide which invisible wavelengths belong in your image before choosing what to block.
Neutral Density Filters: How Much Light Reduction Do You Need?
Turn “too bright” into a useful attenuation target, then check the filter spectrum, mounting and power conditions.
Hot Mirror vs. Cold Mirror: Which Light Should Pass, and Which Should Reflect?
Draw the two light paths before choosing the mirror. The names refer to spectral behavior, not the temperature of the glass.
Longpass, Shortpass or Bandpass: Which One Fits Your Application?
One spectral boundary or two? Choose the filter family by deciding which wavelengths you want to retain.
Choosing a Bandpass Filter for Your LED and Camera
Matching the wavelength on the label is only the beginning. Learn how source bandwidth, background and working angle affect the choice.
How to Read an Optical Filter Transmission Chart
A guided look at a measured KUPO spectrum: find the useful band, read the values and understand the limits of the plot.
Which Optical Filter Do I Need? A Practical Selection Guide
Start with the change you need to make to your light. This guide helps you narrow the filter family before comparing individual products.
Have a particular setup in mind? Tell us what you are trying to achieve, and we can discuss a suitable starting design.