Another Day,
I have a peculiar problem with my AR Coating.We boil the test lens immediately after the Coating. The boiling is done on Saltwater. After boiling if we scratch test the lens, the last Sio2 Layer comes OFF, 99% times from the front surface of the Lens. Seldom its the rare side.The process wise both the sides are done in the same fashion. The lenses are dip hard coated. We use Al2o3 between the long Tio2 or Zr layer and the sio2.
Anyone has suggestions??
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