Individual fluorescence bandpass filters that have been optimized for use in a variety of fluorescence instruments. All thin-film, hard-coated construction for unsurpassed performance and reliability.Optical SpecificationsSpecificationValueTransmission Band 1T_avg > 40% 250 – 258 nmCenter Wavelength 1254 nmGuaranteed Minimum Bandwidth 18 nmFWHM Bandwidth 1 (nominal)9.4 nmBlocking Band 1OD_avg > 4 200 – 245 nmBlocking Band 2OD_avg > 4 264 – 900 nmBlocking Band 3OD_avg > 3 900 – 1100 nmGeneral Filter SpecificationsSpecificationValueAngle of Incidence0 ± 5 degreesCone Half-angle7 degreesOptical Damage RatingTesting has proven to show no signs of degradation when exposed to at least 6.0 W of power from an unfiltered xenon arc lamp over a 25 mm diameter (corresponding to 1.2 W/cm²) for over 500 hrs.Filter Effective Index1.91 Understanding ‘Effective Index of Refraction’ n_effPhysical Filter Specifications (applies to standard sized parts; contact us regarding other sizes)SpecificationValueTransverse Dimensions (Diameter)25 mmTransverse Tolerance (mounted)+ 0.0 / – 0.1 mmFilter Thickness (Mounted)3.5 mmFilter Thickness Tolerance (Mounted)± 0.1 mmClear Aperture≥ 22 mmScratch-Dig60-40Substrate Thickness (unmounted)2.0 mmSubstrate Thickness Tolerance (unmounted)± 0.1 mmOrientationArrow on ring indicates preferred direction of propagation of light