Edmund Scientific optical flat 150mm

Product Description

Vintage Edmund Scientific 150mm λ/2 Precision Optical Flat Mirror

This is a classic λ/2 precision reference flat from Edmund Scientific, the trusted supplier for generations of amateur telescope makers (ATMs) and optical workshops. With a substantial 150mm diameter and 25mm thickness, it offers the stability and accuracy required for serious optical testing and alignment.

Key Specifications:

• Diameter: 150 mm (~6 inches)

• Thickness: 25 mm (minimizes distortion, ensures thermal stability)

• Flatness: λ/2 wavefront (suitable for reliable reference testing)

• Material: Likely fused silica or Pyrex low-expansion glass

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

• Condition: Excellent clean surplus – reflective surface is bright and intact

Why This Edmund Flat Is a Benchmark Tool:

• Proven Legacy: Edmund optical flats were the standard for ATM mirror testing and lab alignment for decades.

• Rigid Design: The 25mm thickness ensures the flat maintains its figure during use, critical for repeatable measurements.

• Ready for Serious Work: Delivers reliable, accurate results for testing optics up to moderate f/ratios.

Applications:

• Telescope Mirror Testing: Reference flat for Foucault, Ronchi, or interferometric testing of parabolic and spherical mirrors.

• Optical Alignment & Autocollimation: Essential tool for aligning optical benches, lasers, or imaging systems.

• Surface Verification: Checking the flatness of other optical surfaces in workshops or labs.

• Historical & Educational: A functional piece of optical history, perfect for teaching wavefront optics, metrology, or the ATM tradition.