IB/E Low Shading Optics
The lenses of the low shading optics family LS 16 - 64 mm are developed for application with high-resolution sensors. Micro lenses in front of CCD arrays cause additional vignetting due to divergent rays at the image plane. Especially wide angle lenses suffer from lower illumination at the edge. That may be different in x- and y-direction. On 5 degree ray-angles, these effects are to ignore. This effects will be avoided with low shading lenses on the basis of suitable design in the image-range. The image quality was improved by the use of high-quality, abnormal glasses regarding light-waste, distortion and MTF. Each system has 9 - 12 lenses.
With MTF-values above 80 % for 40 lp/mm over the whole field the lens is extremely constant. During production avoiding symmetrical optical errors was prior. The low shadings optics systems are calculated specially for the close range about 1000 to 250 mm and an extended spectral-area. A main attention is put on the high-quality mechanics moreover. So as mount-material steel, brass and/or high-solid aluminium is used, which doesn't loose the pass-quality also after repeated change of the optics or focussing plays. The focus-instinct is taken for multiple threads. The correction and the mechanically high-quality implementation predestines the optics for the use at High End Digital cameras. All lenses possess a variable iris and a
variable focus. Optional both are to fixate.
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