6 inch Pyrex telescope mirror

Product Description

Classic 6-Inch Pyrex Concave Telescope Primary Mirror – 150mm Diameter, 16-Inch Focal Length (f/2.7 Spherical)

This is a classic, fast-aperture primary telescope mirror crafted from low-expansion Pyrex borosilicate glass—the legendary material trusted by generations of amateur telescope makers (ATMs). With a 150mm diameter and a 16-inch focal length (f/2.7), this mirror is ideal for building a compact, wide-field Newtonian reflector telescope capable of delivering bright, stunning views of star clusters, nebulae, and comets.

Key Specifications:

• Diameter: 150 mm (≈6 inches)

• Focal Length: 16 inches (≈406 mm)

• f/#: f/2.7 (very fast spherical figure)

• Thickness: 25 mm (thick Pyrex substrate for excellent thermal stability)

• Material: Pyrex borosilicate glass (low thermal expansion, classic pale blue-gray back)

• Coating: Protected aluminum first-surface (broadband high reflectivity)

• Figure: Spherical concave

• Condition: Great surplus – reflective surface intact and clean

Why This Mirror Is a Classic:

• Proven Performance: Pyrex mirrors are renowned for their stability and durability, holding their figure over decades.

• Fast f/2.7 Design: Enables a very short, portable telescope tube with a wide, rich field of view.

• ATM Heritage: A genuine piece of amateur astronomy history, perfect for a traditional build or restoration.

Applications:

• Newtonian Telescope Build: Primary mirror for a 6″ rich-field or compact planetary telescope.

• Optical Projects: As a fast focusing/condensing mirror for laser, projection, or lab bench experiments.

• Educational Tool: Excellent for teaching optics, astronomy, or the history of telescope making.

• Restoration: Perfect for refurbishing a classic vintage telescope.