The Intane Optics 2” mirror diagonal has those features as below:
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Super high surface accuracy of 1/10 wave Peak-to-Valley
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Ultra High Dielectric 99% reflectivity over the visual spectrum
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A zero-height 1-1/4” adapter included
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A brass clamping ring in both diagonal and adapter to prevent marring of eyepieces.
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2" barrel is threaded for filters.