Telescope Diagonals

​Telescope Diagonals

Get Your Diagonals From Us Today!

​Telescope Diagonals

​Made From Precision Annealed Pyrex, Fused Silica Or Zerodur

​Diagonal Minor Axis Up To 8"​

Diamond generated substrates. True 45 degree elliptical diagonal. 1/20th wave RMS.

​Coated with Enhanced Aluminum and overcoated with hard Silicon Dioxide with Reflectance of 95% average in the visible.

Minor Axis

Substrate

Material

​Price

​Substrate

​Material

​Price

Substrate

​Material

​Price

​1.0"

​​Pyrex

​$55.00

​Fused Silica

​$85.00

​Zerodur

​$90.00

​1.32"

​​Pyrex

​$75.00

​​Fused Silica

​$110.00

​Zerodur

​$120.00

​1.52"

​​Pyrex

​$95.00

​​Fused Silica

​$140.00

​Zerodur

​$150.00

​1.83"

​​Pyrex

​$135.00

​​Fused Silica

​$185.00

​Zerodur

​$195.00

​2.14"

​​Pyrex

​$180.00

​​Fused Silica

​$240.00

​Zerodur

​$255.00

​2.60"

​​Pyrex

​$230.00

​​Fused Silica

​$295.00

​Zerodur

​$315.00

​3.10"

​​Pyrex

​$285.00

​​Fused Silica

​$335.00

​Zerodur

​$350.00

​3.50"

​​Pyrex

​$465.00

​​Fused Silica

​$525.00

​Zerodur

​$560.00

​4.0"

​​Pyrex

​$825.00

​​Fused Silica

​$965.00

​Zerodur

​$995.00

​4.25"

​​Pyrex

​$1250.00

​​Fused Silica

​$1475.00

​Zerodur

​$1525.00

​4.50"

​​Pyrex

​$1360.00

​​Fused Silica

​$1595.00

​Zerodur

​$1675.00

​4.75"

​​Pyrex

​$1490.00

​​Fused Silica

​$1695.00

​Zerodur

​$1750.00

​5.00"

​​Pyrex

​$1625.00

​​Fused Silica

​$1775.00

​Zerodur

​$1895.00

​Custom Size

up to 8" Minor Axis

​Pyrex

​Quote

​Fused Silica

​Quote

​Zerodur

​Quote

​Delivery from stock or in the case of larger minor axis and custom we can delivery in approximately 5 weeks from blank to coated mirror.

​Information about the different materials

  • ​Pyrex
  • ​Fused Silica
  • ​Zerodur

​Pyrex glass code 7740 has a Coefficient of Expansion of  32.5 x 10-7cm/°C 

We use Precision Annealed Pyrex.

Pyrex is a borosilicate composition that is used to provide unique chemical, thermal, mechanical and optical properties. These properties enable it to provide long service and fulfill requirements which common window glass cannot meet.

The low coefficient of thermal expansion of Pyrex code 7740 glass allows it to withstand higher temperatures and temperature extremes than ordinary window glass.

>