Originally Posted by
go_hercules
Hi, I have been wondering if there is an effective minimum diameter at which an aspheric lens loses it's advantage. The aspheric surface is most spherical near the center and the curvature gradually flattens out further from the center. So, if the diameter of the lens were say the size of a quarter, you would not be getting as much into the more aspheric zone than if the lens were a couple of inches in diameter. In other words, it seems to me that as the diameter of the lens increases, the usefullness of the aspheric lens increases, and vice versa. So is there a minimum diameter at which the benefit of asphericity is nil? I would be interested in others thoughts on this.
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