Convex Lenses   Concave Lenses   Cylinderical Lenses   Lupe   Video Converter Cylinder Lenses ¢Ã Specifications       Substrate Material       BK7, F2, UV grade fused silica or Quartz etc.       Surface Figure       ¥ë/4 at 633§¬       Surface Quality       60-40       Chamfer       0.30§® at 45¢ª typical       Thickness Tolerance       ¡¾ 0.1§®       Tilt Tolerance       ¡¾ 0.1§® over H       Dimensional Tolerance       + 0.00§®, - 0.30§®       Clear Aperture       Exceeds central 85% of dimension

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