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)
Dimensions (mm): 300 diameter x 25 thickness
Approx. weight (kg): ~2.5
Price (Euro, incl. VAT): 260,-
Photo's of this blank:








Item number: MS02
Description: Pyrex Classical Cassegrain mirror set ready for figuring.
Set contains:
- Prepolished main mirror, diameter 300mm; R=1800 ~F/3;
  thickness (edge)= 45mm; central hole 85mm.
- Prepolished borosilicate secondary mirror diameter=120mm, R= -1040 ~F/1.73,
  thickness edge = 12mm.
- with raw polished borosilicate proof glass for testing secondary R= ~1040,
  thickness edge = 12mm.
- including 3 tools for additional grinding or polishing
Dimensions main mirror (mm): 300 diameter x 45, thickness
Approx. weight main mirror (kg): 6.3kg
Price (Euro, incl. VAT): 400,-
Photo's of this set:







Item number: ST011 (A/B, 2 available)
Description: Borosilicate blank 255x25, unground, no facet
Dimensions (mm): 255 diameter x 25,4 thickness
Approx. weight (kg): 2.9
Price (Euro, incl. VAT): 95,-
Photo's of this blank:






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,-
Photo's of this blank:








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,-
Photo's of this blank:







Item number: ST014
Description: Supremax blank 355x35mm; with 3x holes at 120 deg. 6mm diameter
(for holding in coating equipment or telescope)
Dimensions (mm): 355 diameter x 35 mm thickness
Approx. weight (kg): 7.7
Price (Euro, incl. VAT): 320,-
Photo's of this blank:







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:







Item number: ST016
Description: Borosilicaat blank 400 x 21mm, raw blank, non-facetted/td>
Dimensions (mm): 400 diameter x 21 mm thickness
Approx. weight (kg): 5.9
Price (Euro, incl. VAT): 185,-
Photo's of this blank:







Item number: ST010
Description: Pyrex blank 258 x 45mm(edge), blank with curve generated on one side (R=2680, F/5.2), non-facetted. very small dent bottom side (see third photo)
Dimensions (mm): 258 diameter x 45 mm thickness
Approx. weight (kg): 4.5
Price (Euro, incl. VAT): 75,-
Photo's of this blank:







Item number: ST005
Description: Pyrex blank 310 x 45mm(edge), blank with raw curve generated on one side (~6mm deep, F/3),
with 3 holes at 120 degr. for mounting in coating equipment or telescope.
Dimensions (mm): 310 diameter x 45 mm thickness
Approx. weight (kg): 6.8
Price (Euro, incl. VAT): 60,-
Photo's of this blank:







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

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