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Leica Factory Tour<br />
The Summilux-C Cine Lens Team at the Leica factory in Solms (above).<br />
The new Leica Summilux-C lenses have a multi-aspheric lens design. Aspherical<br />
lenses have complex curved surfaces—the radius of curvature changes<br />
according to distance from the optical axis. Aspherical lenses can concentrate<br />
all the light onto one point, provide improved correction of aberration, and higher<br />
resolution.<br />
After grinding to a precision of 1 micron, the next step is polishing (below). For<br />
aspherical lenses, the polishing machine uses a small rotating tool that travels in<br />
a controlled path along the rotating element, “carving” the shape of asphere. It’s<br />
a much slower, more accurate process than for spherical surfaces—accurate to<br />
several nanometers.<br />
Next, computer generated holograms measure the shape of the asphere to<br />
check for any deviations. The data is saved and loaded into the MRF (Magneto-<br />
Rheological Finishing) machines, which polish and correct any irregularities.<br />
Download the full Leica story online at: www.fdtimes.com/go/leica<br />
Dec 2010<br />
63
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