Bartjan

Bartjan

  • Toegetreden: 2014-10-29
  • Artikelen: 84

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20cm f4.2 mirror

  GRINDING January 2000 The pyrex disc (205x 20mm) is hollowed out to approx. f4.5 by J.Eindhoven in Haaksbergen. I cast a 4 cm thick plaster disk on it and after 1 week drying I glued 19x19x2 mm porcelain tiles…