broad-rimmed, plastic mountings, diameter 1,5" / 38 mm (lens diam. 0,8" / 21 mm ).
The lenses are grounded with the greatest precision (pitch polished like high quality objectives).
They are plano-convex or -concave. The lenses can be positioned close together,
so that their refraction is equal to the sum of single lenses. The reduced aperture ensures sharp image formation and light weight.
• Our trial lenses meet the requirements of DIN 58207.