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Waveguide vs birdbath optics: which one survives bright daylight? High-NA EUV: what does the smaller feature buy and what does it cost? Why does thermal expansion matter more than glass choice in high-power laser optics? Why do laser optics come with a damage threshold spec instead of just wavelength and focal length? What the purple and green tints on an anti-reflective coating actually tell you How much spherical aberration does one aspherical element remove from a fast prime lens? Metasurface lenses: what still keeps them out of phone cameras? Why is the field of view on AR glasses still so narrow? How is a multi-layer optical filter designed to pass one narrow wavelength band? Why does a lens with more elements not always produce a sharper image? Reading an optical test report: what the Zernike coefficients are telling you What causes lens flare and how do nano-etched coatings suppress it? Telecentric lenses in machine vision: when an ordinary lens ruins your measurement ED glass vs fluorite in long telephoto designs: which aberration does each one fix? Fitting a waveguide into prescription frames: what has to give?

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