Partially cover the range: Show products that work over part of the specified range.
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Coatings are used to alter the reflective properties of a surface. They can be used to increase transmission (AR Coatings), increase reflection (HR Coatings) or selectively transmit or reflect certain wavelengths.
The focal length measures the strength of an optical system to converge (focus) or diverge light. It is related to the radius of curvature and inversely proportional to the optical power.
Surface Irregularity, Surface Flatness or Surface Figure is the maximum deviation from a fully flat face along the same lateral dimensions specified in fraction of reference wavelength.
Thickness indicates the distance between two surfaces. Larger thickness allows for greater heat dissipation and higher resistance to stress in machining, blocking, and handling, however it increases weight and dispersion.
The f/# is the ratio of the focal length, (f), of the lens to the effective aperture diameter. The larger the f-number, the smaller the aperture, and the lower the light throughput.