Mirror making

56 cm f3.7 mirror

15 dec 2014 I bought a 56 x 3.1 cm Suprax borosilicate disk from Stathis Kafalis in Munchen for about 800 euro. It was made by Schott. The mirror ( if it succeeds) will be the replacement of the very…

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30 cm f4.9 mirror

30 cm f4.9 mirror December 2017 The  mirror is made from an already existing  50 mm thick pyrex miror that is f6 Sagitta is ca 2.9 mm over 290 mm diameter. It will have to be about 3.5 mm Excavating…

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44 cm f3.4 mirror

44 cm f3.4 July 2016 The idea started when I thought of a large deepsky telescope that would fit in one piece in my Renault kangoo van. Jilles Eindhoven in Buurse had a 45 cm 34 mm thick pyrex disk…

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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…

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60cm f4.3 mirror

60 CM  MIRROR This one has always been a dream for me. But the prices of the glass!!  When I started thinking about a 60 cm, the price of a disk was ca 5000 dollar.. Suddenly, I heard about  pyrex…

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47cm f3.9 mirror

  47 cm f3.9 mirror   The suprax disk measuring 480×40 mm was purchased in 1998 and converted to a f5.1 mirror in 2004. After some years I decided to convert it to a mirror with shorter focal length, just…

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47cm f5.2 mirror

  47 cm f5 mirror Jan. 1999 I bought the 48 x4,0 cm Suprax low expansion disk from Beacon Hill telescopes in Cleethorpes (UK) . net price : 408 pounds Spring 1999 I had a f5.1 radius generated in the…

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