Source 4 ellipsoidal lenses
While performing routine PM on a couple of S4 ellipsoidals, I noticed that the one of the lense tubes contained 2 lenses. The 26 degree piece was in its assigned 'slot'; but there was also a second lens in the tube-in the very first slot-- closest to the 'gate' end of the tube. What is the purpose of the second lens? Thanks for any info. John A
While performing routine PM on a couple of S4 ellipsoidals, I noticed that the one of the lense tubes contained 2 lenses. The 26 degree piece was in its assigned 'slot'; but there was also a second lens in the tube-in the very first slot-- closest to the 'gate' end of the tube. What is the purpose of the second lens? Thanks for any info. John A
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