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Midwest Optical Systems LP190-46 Acrylic Filter Midwest Optical Systems LP190-37 SapphireMidwest Optical Systems LP190 46 Sapphire Protective Window M46 Protective Filters Often referred to as a sharp cut filter, Longpass Filters are specifically designed to pass a broad spectrum of longer wavelength light while blocking shorter wavelengths. Longpass Filters are often used in fluorescence applications to block an excitation light source or to pass multiple emission wavelengths, improving signal to noise ratio. Longpass Filters are also