Zight Mirror Blanks

Zight: Enhancing Your Telescope View with Precision Mirror Blanks

United Glass LLC

A man next to a telescope gazing at the stars through Zight's mirror

Why consider Zight for your telescope mirrors?

Our team’s focus on your market ensures we develop products that are actually designed with your needs in mind. And because we manufacture here instead of overseas, you’re not eating increased costs from having the glass freighted across the Atlantic and stored in the US.


What kind of product availability and order turnaround can I expect from Zight?

We manufacture and stock all the most commonly used tools and blanks so there’s no worry on your end whether the glass you need is available. And rest assured, if we don’t have the size you’re looking for in stock, we’ll make it and have it ready for you within a couple weeks.


Custom sizes to suit your needs

We understand that having the right tool can make or break your mirror grinding project. We can make any size you need, talk to your Zight representative about it.

Zight for Stars

United Glass LLC

Borosilicate 3.3 Mirror Blanks - Annealed

Circular glass manufactured in 3.3 Borosilicate has been the standard in the mirror-making industry since the float method manufacturing was introduced. This methods ensures your glass is made with:


  • · A great melt, removing micro-bubbles and strain lines which can impact the quality and optics of the mirror.
  • · A highly parallel and flat surface, which helps you save time and avoid unwanted variances when grinding & polishing your mirror.
ZIGHT Borosilicate Glass telescope

Optical Properties

ZIGHT Borosilicate Glass is completely transparent and shows no substantial absorption of the light spectrum.

  • · Refractive Index: 1.473 (λ = 587.6 nm) n
  • · Photoelastic constant: 5.0*10—6 mm2 .N—1
  • · Thermal Expansion Coefficient: 3.3 X 10-6ºK
  • · Density: 2.23 g/cm3
A woman observing the moon through a telescope using the glass eyepieces manufactured by Zight.
ZIGHT FOR STARS

Tempered vs. Annealed

A tempered glass is much harder (because of the thermal treatment it undergoes) making it better suited for industrial applications but less suited for applications where the glass will be machined down or transformed. With annealed glass, the glass can be cut, drilled, machined or polished without loosing its properties or shattering.

Zight for Stars

United Glass LLC

Soda Lime Glass Tool - Annealed

Soda lime glass is ideal for mirror grinding tools and many of our customers now prefer using a glass tool over a ceramic tile disc. Soda lime is also produced by the float method and ensures:


  • · A great melt, removing micro-bubbles and imperfections.
  • · A highly parallel and flat surface, giving you total control of how you shape and prep your mirror tools.

Soda Lime is an excellent alternative to other tool materials as it allows for an ideal glass-on-glass grinding process but with a more cost-effective glass material than the borosilicate blank.

Not to mention eliminating the typical disadvantages of using tile (like water proofing and degradation).

Soda Lime Glass Tool - Annealed Zight Telescope

Optical Properties

ZIGHT Borosilicate Glass is completely transparent and shows no substantial absorption of the light spectrum.

  • · Refractive Index: 1.473 (λ = 587.6 nm) n
  • · Photoelastic constant: 5.0*10—6 mm2 .N—1
  • · Thermal Expansion Coefficient: 3.3 X 10-6ºK
  • · Density: 2.23 g/cm3
ZIGHT FOR STARS

ANNEALED BLANKS & TOOLS

There are some common sizes we normally keep in stock to cover any urgencies that come up. However, we can swing any size you need with a favorable lead time that you won’t find with anyone else.

Unit ID(d) Overall Diameter(t) Overall Thickness
XX-6X256" (152.4mm)1" (25mm)
XX-8X258" (203.2mm)1" (25mm)
XX-8X328" (203.2mm)1.25" (32mm)
XX-10X3810" (254mm)1.5" (38mm)
XX-12X3812" (304.8mm)1.5" (38mm)
XX-12X5112" (304.8mm)2" (51mm)
XX-16X5116" (406.4mm)2" (51mm)
XX-24X7624" (609.7mm)3" (76mm)
XX - Product Code
AB- Annealed Borosilicate
AS- Annealed Soda Lime
QZ- Quartz (Fused Silica)
annealed blanks & tools Zight imagen mirror
ZIGHT FOR STARS

Need a different size?

We can make any custom size for your mirror blanks. Just ask one of our Zight representatives about how to get the perfect size glass for your project.

First Name*
Last Name*
Email*
Phone Number*
Company Name
Message