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Filter-FlatHP-520 Single flattening filter for 3x 600nm reduction plus 520nm High-Pass filter for protecting UV-sensitive films during measurement.
Filter-Flattening Filter for flattening spectral response, which improves signal-to-noise at wavelength extremes - single filter for 3x reduction at 600nm.
Filter-Flattening X2 Filter for flattening spectral response, which improves signal-to-noise at wavelength extremes - double filter for 9x reduction at 600nm.