Daystar Filters is very proud of our 40+ year history providing research grade equipment to the world's top research institutions. Our process can produce the highest grade quality equipment in the world, with unprecedented uniformity and finesse distinction.
Due to the nature of the mineral mica crystals used, the Daystar pricing structure is tied to etalon uniformity. Our Quantum products are offered in SE grade and PE grade uniformity. All Quark filters are warranted to meet or exceed the SE grade uniformity standard.
Due to scarcity and certification requirements, PE grade uniformity is reserved for our top-end Quantum PE product line.
The uniformity grade of a filter is based on the uniformity in abundances of chemical composition (and subsequent index of refraction) within the natural mica crystal. Prices for the PE grade filters reflect the rarity of the required uniformity in homogeniety.
- STANDARD SE GRADE filters are specified as: Spectral uniformity: The mean peak wavelength of all 12 mm. dia. areas shall be within 0.5 Angstrom of the full aperture wavelength measurement.
- PROFESSIONAL PE GRADE filters are fabricated and qualified to very high uniformity tolerances to the specification of Spectral uniformity: The mean peak wavelength of all 12 mm. dia. areas shall be within 0.05 Angstrom of the full aperture wavelength measurement. (In fractions of a wavelength of light, this accuracy is equal to 1/131,260 wave).
- QUARK Filters share the Standard SE grade filter specifications, and are specified as: Spectral uniformity: The mean peak wavelength of all 12 mm. dia. areas shall be within 0.5 Angstrom of the full aperture wavelength measurement
Due to production processes and scarcity considerations, uniformity above specified SE grade cannot be guaranteed in a production QUARK. Therefore, hand selection of "honey" or "extra good" QUARKS is also not possible. All filters are tested prior to shipping both spectroscopically and visually to meet or exceed the SE grade qualification standard.