Written by Dan S. When a lens is placed between two bell chucks during the centering operation the lens The 'Z-Factor' , as it is sometimes called, essentially determines the tangent of the angle between the surface normal of each radius at the contact height and compares it to a certain value. The 0.56 is that tangent. So essentially if the angle between the surface normal of the two surfaces at the contact height is >=29 degrees than the lens should self-center. If the angle is smaller then the lens will not self-center with at least a little help.
Since this is my first Android app, and I am not a programmer, I'd appreciate any comments, corrections, or suggestions (email them to dstrosch at gmail dot com). Reference: Karow, H.,H. Fabrication Methods for Precision Optics, Wiley, 1993, pg 524 |