Polyester longpass filters
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Polyester filters have the dye held in a thin sheet of polyester. Polyester colour filters have a wide range of characteristics available and the sheets can easily be cut in the laboratory.
Whilst polyester filters are cheap and simple to use, the characteristics are not as well controlled as other absorption types and they can be susceptible to bleaching if exposed to high levels of UV.
These polyester Filters are reasonably robust and inexpensive and are ideal for displays and protective screens to reduce unwanted ambient light. They are available in sheets at 75mm square and can be cut to custom dimensions. At 0.1mm thick these polyester filters are flexible and the range covers the visible spectrum.
Polester longpass filters are not currently available as a stock item, however Knight Optical offer an extensive custom optic service thanks to our many years experience in the industry, and we can supply bespoke polyester filters for a range of wavelengths and cut to fit individual applications. For more information on our custom polyester filters and other filter types available from Knight Optical, contact out technical sales team.