![]() ![]() Our Aspherabs™ address this problem, and we use doublet lenses to reduce aberration in our F/1 condensers. So, while a low F/# singlet lens (≤F/4) may be an efficient collector, you will get such a poor output beam that you cannot refocus it efficiently. No optical system can focus a poor quality beam to a good image of the source. Even for a point source it will include rays at various angles, far from the collimated ideal. Though more light is collected by a very low F/# lens, the beam produced is imperfect. These aberrations go up rapidly with decreasing F/#. Low F/# lenses collect more flux, but the lens aberrations determine the quality of the collimated output. However, note, there is a difference between total radiant flux collected and useful radiant flux collected. Since light collection varies as 1/(F/#)2, decreasing F/# is a simple way to maximize light collection. ![]()
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