Telescope mirrors  > Telescope mirror blanks  
   Telescope mirror blanks
Below you find the list of telescope mirror blanks that Huygens Optics has in stock. Prices are reduced since the stock is currently being phased out.

As indicated, most blanks are made of either Schott Borofloat or Schott Supremax. Both materials are a low expansion borosilicate glass with very low stress levels. An advantage of Borofloat over Supremax is that the surface is much smoother and generally more flat than that of Supremax. Thus it requires less grinding to create a flat surface.
For more information on surface roughness an flatness of Borofloat and Supremax, see the specs sheets of these materials: Borofloat-33 and Supremax. In addition, some blanks are mare of Pyrex glass, which is generally cast into a disk shaped mold.

All items below are available for immediate shipping or collection in Hilversum. Prices are in Euros and include 21% VAT. Shipping costs not included. Indicative shipping costst within the Netherlands 10-25 Euros, dependent on size and weight. For shipping to outside the Netherlands, please contact me for more information.




Item number: M01
Description: Borofloat-33 raw mirror 300x25. Front side surface Radius 2770mm or ~F/4.60
fine ground + pre-polished to raw sphere
back side grinded flat. With 3 holes (6mm diameter
for holding the mirror in coating equipment or telescope)
The dark color is spay paint on the back side used for quality check
And can easily be removed
Dimensions (mm): 300 diameter x 25 thickness
Approx. weight (kg): ~2.5
Price (Euro, incl. VAT): 260,-
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Item number: ST015
Description: Supremax blank 314 x 40 mm, with 3x holes at 120 deg. 8mm diameter
(for holding in coating equipment or telescope), flattenend on one side
Dimensions (mm): 314 diameter x 40 thickness
Approx. weight (kg): 6,9
Price (Euro, incl. VAT): 345,-
Photo's of this blank:







Item number: ST008
Description: Supremax blank 455 x 47.6 mm, with 3x holes at 120 deg. 8mm diameter
(for holding in coating equipment or telescope), facetted
Dimensions (mm): 455 diameter x 47.6 thickness
Approx. weight (kg): 17.3
Price (Euro, incl. VAT): 780,-
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Item number: ST009
Description: Supremax blank 455 x 47.6 mm, raw blank, non facetted
Dimensions (mm): 455 diameter x 47.6 thickness
Approx. weight (kg): 17.3
Price (Euro, incl. VAT): 750,-
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Item number: ST013
Description: Borosilicaat blank 400 x 25mm, raw blank, non-facetted
Dimensions (mm): 400 diameter x 25,4 mm thickness
Approx. weight (kg): 7.1
Price (Euro, incl. VAT): 225,-
Photo's of this blank:







All prices include 21% VAT but exclude shipping costs to your location.