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.
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| 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)
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| Dimensions (mm): |
300 diameter x 25 thickness |
| Approx. weight (kg): |
~2.5 |
| Price (Euro, incl. VAT): |
260,- |
| Photo's of this blank: |
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| 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
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| 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: |
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| 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: |
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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: |
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| 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: |
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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,- |
| Photo's of this blank: |
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| 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: |
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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: |
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| Item number: |
ST016 |
| Description: |
Borosilicaat blank 400 x 21mm, raw blank, non-facetted/td>
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| Dimensions (mm): |
400 diameter x 21 mm thickness |
| Approx. weight (kg): |
5.9 |
| Price (Euro, incl. VAT): |
185,- |
| Photo's of this blank: |
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| 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: |
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| 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: |
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All prices include 21% VAT but exclude shipping costs to your location.
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