The fluorescent filter produced by HB Optical is manufactured by IAD process, which has good spectral performance and long service life. Apply these filters to obtain high-contrast, clear, and realistic high-quality images. Product features: high transmittance (T>90%), deep cut-off background (>OD6), high signal-to-noise ratio, high accuracy (wavefront distortion <0.25λ). Newer filter products are used: high contrast rectangular bandpass filter and sharp cut-off broadband filter, the background cut-off depth is increased to 10-6, the background is darker, the contrast is better, and the image is brighter Clear.