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In the field of Entertainment Stage Lighting there is wide variety of luminaires with beams of different intensity distributions. It would be advantageous if the optics allowed to adjust the edge sharpness.
Henning Rehn
"A unusual zoom design for a variable edge beam", Proc. SPIE 12078, International Optical Design Conference 2021, 1207814 (19 November 2021); https://doi.org/10.1117/12.2603649
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Henning Rehn, "A unusual zoom design for a variable edge beam," Proc. SPIE 12078, International Optical Design Conference 2021, 1207814 (19 November 2021); https://doi.org/10.1117/12.2603649