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DayStar Instruments UNIFORMITY STANDARDS
Dramatic plasma shapes around AR2335. Large view, false colors.Taken with DayStar Quark H-alpha filter, a monochrom PointGrey USB3 camera and a SW ED 120 telescope.
Daystar Instruments QUARK is the first Hydrogen Alpha "Eyepiece"  

This Many of our new QUARK owners are achieving incredible images using DayStar QUARKs.  Left, we see Gabriel Corban's Astrophoto has achieved incredible resolution with 120mm aperture using his QUARK.

DAYSTAR QUARK UNIFORMITY STANDARDS:

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. (In fractions of a wavelength of light, this accuracy is equal to 1/13,126 wave).

  • 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.

Those who require true PE grade uniformity should consider the original Daystar Quantum PE line of filters for their application. Note that SE grade filters do not qualify as warranty repairs to upgrade to PE grade filters.

Any QUARK may be returned to DayStar for inspection of uniformity standards. If the filter does not pass SE grade uniformity standards, that filter will be replaced under warranty.


* HALF-BANDWIDTH: The term half-bandwidth refers to an optics industry standard of measure.  On a chart depicting the peak where light is transmitted, that peak's width is measured at the point 50% between zero and full transmission. This term is called half-bandwidth.

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Hydrogen Alpha Filters

Current Delivery Times
Click for In-stock items

0-10 days for:
Original Quark
Q
uestar Quark
Combo Quark
Calcium Quark

2-4 weeks for:
Blocker and Trimmers
ION Filters
CaII H line filters
Quantum upgrade:  
Quantum SE Filters
SolaREDi 66 Scopes

3-6 months for:
Quantum PE Filters
Ca II K Line PE Filters
Sodium Line FIlters
SR-127 Telescope
Solar System Filter Wheel

All DayStar Hydrogen a filter assemblies need to be used in conjunction with a lens cover and Energy Rejection Filter.

Offering absolute precision control over wavelength transmission. . .

DayStar Filters LLC • 149 Northwest OO Highway • Warrensburg, MO 64093 - USA
Telephone: 866-680--6563 • service@daystarfilters.com • FAX: 1-866-791-0448