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Ships within 48 hours · Estimated delivery Aug 20 - Aug 25
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Description
75mm Optical Flat, λ/20, Fused SilicaPrecision fused silica optical flat, finished by classical continuous pitch polishing the same method Lunt has refined over 25 years of building precision Fabry Perot etalons for solar telescopes. Surface flatness measured power included: total deviation including curvature, not power removed. Diameter 75 mm Flatness (P V) 20, power included at 632. 8 nm Material Fused silica Construction Single surface one polished reference face Surface quality
Precision fused silica optical flat, finished by classical continuous pitch polishing — the same method Lunt has refined over 25 years of building precision Fabry-Perot etalons for solar telescopes. Surface flatness measured power-included: total deviation including curvature, not power-removed.
| Diameter | 75 mm |
| Flatness (P-V) | λ/20, power-included at 632.8 nm |
| Material | Fused silica |
| Construction | Single surface — one polished reference face |
| Surface quality | Better than 60-40 scratch-dig (typical) |
| Surface roughness (RMS) | Below 0.020 wave |
| Clear aperture | 90% of diameter (67 mm) |
| Secondary surface | Fine ground to suppress back-surface reflection |
| Coating | Uncoated |
| Wavelength reference | 632.8 nm (HeNe) |
| Packaging | Protective storage case included |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy