Visible Light Wavelength Tunable Filter with Exchangeable Filter (VTFM/FC) Wavelength of our conventional TFM/FC is 1260~1650nm. This new VTFM/FC can be used in 480-850 nm. Wavelength range of main unit(VTFM): 80 nm (CWL ±40 nm) Tunable range of filter cassette (FC): 10nm If you have any interest in this device, please contact us.