Hello.
It is a period of discussions with the lab-guys who build lenses for my coating lab :angry:.
Rencently we found problem on 1.74 concave sux lenses after hardcoating.
Looking defects with a stereo-microscope i see small cuts (less than 4/10 mm) on the hardcoat surface circular-arranged near the border of the lens (in a crown of 20 mm of thickness) .
Problems of lens polishing ??:bbg:
What can you think about it ??
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