Optical Filters FAQs

Here we have provided comprehensive lists of commonly asked questions regarding our Semrock optical filters and related applications. This information is designed to support your inquiries, but if you don’t find the answers you are looking for we encourage you to contact us for further assistance.

Please use the sort buttons in the left navigation to navigate between questions and answers that are specific to Optical Imaging Systems, Fluidics, Cameras, Microfluidics, our Webstore, and Engineering Partnership.


Can you combine two filters within an optical test set-up to achieve deeper blocking?

One way to combine two filters for deeper blocking is to slightly tilt the filters relative to each other. Interference filters reflect rejected light, so the slight tilt ensures the rejected light is reflected out from between the pair of filters.

combining 2 filters diagram


To learn more about combining filters, we have a presentation on  “Coherence and Combining Filters”