> DayStar Filter	> T-Scanner Filters	> Alpha Filter Series
> Calcium II	> Quantum Filters	> Sodium Na D-line Filters

Model: DayStar Filter

Description :

DayStar Filters are the academic standard in narrow bandpass astronomical solar filters.  For decades, professional observatories and universities worldwide have counted on the superior quality and performance of DayStar filters.  They can be found in the world's major educational institutions and research facilities, both terrestrial and flown.

The superior DayStar solid spaced etalon design is adaptable to a wide variety of astronomical telescope systems offers high enough uniformity to be introduced at the rear of the telescope. The T-scanner and Quantum series may be used on almost any telescope in the correct configuration.

DayStar's unique solid spaced technology achieves narrower bandpass in one etalon and superior uniformity for more a more detailed image. Combined, these design differences accomplish the highest quality view in contrast and resolution possible, limited only by seeing or diffraction.

DayStar ultra-narrow bandpass filters are available in half-bandwidth as wide as 10Å or as narrow as 0.2Å in the following wavelengths:

• Hydrogen Alpha

• Calcium H and K Line

• Sodium D Line

• custom wavelengths available upon request.

Take a look at DayStar Filters. You will like what you see.

Model: DayStar Hydrogen Alpha T-Scanner Filters

Description :

DayStar Sub-angstrom Hydrogen Alpha filtters are rear-mounted filter assemblies designed to operate at the eyepiece position of the telescope. This allows greater adaptability to different telescope configurations and for larger telescope apertures. Rear-mounted filter systems allow for high resolution observing and imaging at focal lengths frequently in excess of 1000mm. Our filters are classified by bandwidth, not aperture. Narrower bandwidth filters reduce off-band transmitence and increase contrast. The smaller the bandwidth, the higher the contrast between on and off/band light.
DayStar T-Scanner Filters require NO POWER to operate properly.

• DayStar T-Scanner Filters are very inexpensively priced.

• DayStar T-Scanners can be mounted on almost any telescope from 60mm to 600mm.

• DayStar T-Scanners can be used full aperture* on most telescopes.

• DayStar T-Scanner Filters can show a choice of the full disk or high resolution.

• DayStar T-Scanners are robust. Shipping by ground service does NOT void our 10 year warranty.

The T-Scanner model (like all non-heated narrow bandpass solar filters) is designed to operate best at an ambient 75 degree temperature with a tilt knob adjustment to accomodate a shift of approximately 20 degrees F. Observers in climates likely to vary greatly who want to use their filters year-round without temperature concerns should consider the Quantum Series as an affordable option.

 

Filter Assemblies
Half-bandwidth  (Maximum @ f/30)
0.8 ångström		Filters with 0.8 ångström bandwidths will reveal prominences in high contrast
0.7 ångström		Filters with 0.7 ångström bandwidths will reveal prominences in high contrast and occasionally, surface texture.
0.6 ångström		Filters with 0.6 ångström bandwidths will reveal some surface contrast as well as prominences.
0.5 ångström		Filters with 0.5 ångström bandwidths will reveal better surface contrast as well as great prominences.
0.4 ångström		Filters with 0.4 ångström bandwidths will reveal excellent surface contrast as well as fine chromosphere detail.
0.3 ångström

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

Model: DayStar Filters NEW Quantum Hydrogen Alpha Filter Series

Description :

This completely redesigned precision heated housing incorporates ALL of the desired features for today's solar observer or researcher... and then some. Operation couldn't be simpler, just plug it in and a green light indicates when the filter is on band.

The housing operates at 12VDC for field or battery use, included is a 100-240 power supply with US, European, UK and Australian adapter wall plates, live LCD readout of the filter's wavelength output (accurate to 0.1Å) and red /blue wing shift buttons that can precisely tune wavelength up or down for Doppler studies.  The unit even includes a serial port for computer control capability for on-screen display of filter readout. The new Quantum Series body style is all about ease of operation.... total simplicity. 

The Quantum SE series are designed for most amateur and some academic applications. These filters meet the critical DayStar quality control criteria applicable in all visual and some photographic environments.  

Our Quantum PE series is designed for professional research studies and applications in which precision homogeneity and on band transmittance values across the substrate surface are required. These filters require additional quality control steps and additional fabrication and testing time.

All new heated DayStar Filters produced will feature this new housing style at no increase in cost to the user. Owners may upgrade their existing ATM or University model DayStar filters to the Quantum series housing for $700.00.  Delivery time on upgrades is currently 6-10 weeks from receipt of filter and payment.

T-scanners will continue to be available as before, at the previous pricing schedule.

 

(Standard Edition)	(Professional Edition)
Half-bandwidth	Half-bandwidth
(Maximum @ f/30)	(Maximum @ f/30)
0.7 ångström	0.8 ångström
0.6 ångström	0.7 ångström
0.5 ångström	0.6 ångström
0.4 ångström	0.5 ångström
0.3 ångström	0.4 ångström
	0.3 ångström

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

* 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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Model: Calcium II H line and K-line Filters

Model: DayStar Calcium K-line Quantum Filters

Description :

A screen-shot of the new DayStar Quantum Control Software for Calcium II K line.

Model: Sodium Na D-line Filters

Description :

University series filters are designed to operate unheated on the lower of the two Na D emission lines; and can be heated to accomplish transmission on the higher of the two Na D lines, making doppler studies possible by photographing in each line and derriving difference images after subtracting an average solar velocity image. This process is referred to as a dopplergram velocity image, reveals the surface motions associated with supergranulation.

These filters have until now been primarily used for research purposes only, performing doppler and supergranulation studies. Narrow bandpass Na D line filters have also been used in deep-sky observations of IO, but with significantly larger apertures.

Mount Wilson Solar Observatory

DayStar Sodium Filter assemblies

	0.4Å Single cavity Amateur T-Scanner filter system  - suitable for visual or photographic observing
	0.4Å Single cavity University series filter system  - suitible for photographic and visual observing

 

* Note. These systems require an energy rejection pre-filter and F/30 focal ratio for onband operation.  Standard yellow glass DayStar Energy rejection filters provide sufficient off-band energy rejection, as do dielectric 'hot mirror' coated pre-filters.

Photo by Greg Swaim DayStar Filters 0.4Å Sodium D line filter	Short lived solar flare flashes in Na D line: Photo by Greg Swaim DayStar Filters 0.4Å Sodium D line filter

In order to compute the proper aperture reduction mask, divide your telescope EFL or Focal Length by 30.  To compute the proper aperture using a barlow, use the adjusted EFL which includes multiplication by your barlow.  See formula below for details.

DayStar Filters Adapters - Snouts and Plates