Aspheric Condenser Lens
1. On one surface of the condenser lens, the radius of curvature varies with height from the optical axis to minimize spherical aberration. 2. Compared with a spherical lens, it has a larger clear aperture, higher NA and lower f/#. 3. Its shorter focal length allows it to be positioned closer to other optical components. 4. It is generally pressed from B270 optical glass, enabling complex surfaces that are difficult to grind.
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