solar filters

DayStar Quantum SE 0.3A Hydrogen-Alpha Filter - .3QSE

DayStar Filters   ——   SKU: DAY-.3QSE
$11,628.90 CAD
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Product Info


About the DayStar Quantum SE 0.3A Hydrogen-Alpha Filter...

The DayStar Quantum Hydrogen-Alpha Solar Filter has a completely redesigned, precision-heated housing that 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 DayStar Quantum H-Alpha Solar Filter is on band.

The DayStar Quantum Hydrogen-Alpha Solar Filter housing operates at 12VDC for field or battery use. The unit includes 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 0.1) and red /blue wing shift buttons that can precisely tune the wavelength up or down for Doppler studies. The DayStar Quantum H-Alpha Solar Filter even includes a serial port for computer control capability for on-screen display of filter readout. The DayStar Quantum Series body style is all about ease of operation.... total simplicity.

When you begin using the DayStar Quantum Hydrogen-Alpha Solar Filter, the screen displays a startup message with the bandpass and PE/SE quality of the optics. The filter shows a readout of the wavelength currently being transmitted by the filter. The central emission line of Hydrogen Alpha is 6562.8A. When your DayStar Quantum H-Alpha Solar Filter is first plugged in, it should read a wavelength below Ha. As it heats up, it will reach the 6562.8 and stop. In order to see the target wavelength, press the red or blue buttons. Another number will appear, blinking. This is the TARGET wavelength. It will return to the current wavelength readout after you release the button.

Once the target wavelength is reached, the DayStar Quantum Hydrogen-Alpha Solar Filter will wait approximately 8 minutes before the yellow light turns green. This allows the heat to radiate completely through the DayStar Quantum H-Alpha Solar Filter optics to assure you are ON the target wavelength indicated.

DayStar Filters are designed to be mounted at the rear, eyepiece end of the telescope. This application allows flexibility to use the DayStar Quantum Hydrogen-Alpha Solar Filter on many different kinds and sizes of telescopes. You are not aperture limited when using a DayStar Quantum H-Alpha Solar Filter. Many DayStar owners use their filters with apertures of 150mm or greater with great success.

The important idea to remember when using a DayStar Quantum Hydrogen-Alpha Solar Filter is that light entering the filter must be as close to parallel as possible. That is to say that your focal ratio should be approximately F/30. Lower F/ratios allow light to enter the DayStar Quantum H-Alpha Solar Filter at different angles, affecting performance. The diagram to the side demonstrates how owners can adapt different telescopes to the F/30 required by either introducing a barlow (negative lens) or by masking the objective and reducing the aperture. The result of using a telescope at a faster focal ratio is a wider transmission of the filter. A 0.5A filter will transmit a wider spectrum at shorter f/ratios, and its bandwidth will increase at F/8 or F/5 to more than 1A.

With DayStar rear-mounted filters, an observer has a choice of high or low resolution configurations on a choice of dozens of telescopes: 

A: USE FULL APERTURE. This method requires a barlow. Insert the barlow, then insert the DayStar Quantum H-Alpha Solar Filter behind it and you''re ready to observe in high resolution for amazing detail. The barlow power required for full aperture observing is 30/the f ratio of your telescope. For example, an F/8 needs a 4X barlow. (30/8 = about 4).

B: USE AN APERTURE MASK. Stop down your front aperture. Use no barlow. Just insert the DayStar Quantum H-Alpha Solar Filter in the focuser of your telescope and you''re ready to observe full-disk. The aperture you need to reduce down to is your Focal Length (EFL) divided by 30. For example, a 2500mm EFL telescope would use an 83mm aperture mask.

C: TRY A COMBINATION OF A & B. Use a smaller barlow and a slight aperture reduction mask. Use half your aperture and a lower power Barlow for a nice compromise between resolution and field of view. ANY DayStar Quantum H-Alpha Solar Filter can be used on any telescope configured this way.

Don't forget... We also carry the amazing DayStar Quark H-Alpha Filter Eyepiece!


DayStar Quantum SE 0.3A Hydrogen-Alpha Filter Features...


  • Clear and usable aperture: 32 mm. (1.25")


  • Bandwidth measurement: 19 mm (0.75") central aperture


  • Fully blocked transmittance: 4%-8% of polarized light.


  • Lower values correspond to narrower bandwidth filters


  • Off-band rejection: Average optical density greater than 6.0 from X-ray to beyond 2.0 microns


  • Optical components: Selected instrument quality.


  • Air-glass interfaces are anti-reflection coated in the filtering assemblies.



DayStar Quantum SE 0.3A Hydrogen-Alpha Filter Specifications...

Filter Type: DayStar Quantum SE (QSE) 0.3A HA Filter

Status indicator with wavelength readout and bandpass control buttons with 1.0 A offset capability.

Red/yellow/green LED status light, 3mm diameter. Green = normal operation, filter on band. Yellow = filter warming up, please wait. Red = fault, low battery or high voltage.

Rated supply voltage input: 10-30V DC with 5.5x2.1mm jack, typical 10W at 12V.

Fully operational with reverse polarity. Maximum 2.5 amp heater power consumption.

Over-voltage, over-current and over-temperature protection

AC wall adapter/cord included: Worldwide 100-240V AC, 50-60Hz, 18W, 6 foot cord, with supplied ungrounded user-interchangeable US, Euro, UK, and Australian plugs.

Power options: AC adapter, alligator clips (not included), cigarette lighter cord (not included) Operational with European 24VDC automotive cigarette lighter.

Temperature regulation: 0.5C (0.05A) Temperature control method: PID (Proportional / Integral / Derivative).

Operating temperature range: 0C to +40C, 20-80% humidity non-condensing (*For on-band operation, temperature should not to exceed optimum temperature noted on manufacturer'''s label.)

Standard Heater is NOT certified for use in vacuum, and is NOT radiation hardened.

RoHS compliant, lead free electronics. EPA Energy Star.

RS232 computer interface for future filter status and offset control programming.

Software: Compatible with Windows operating systems. Requires 9-pin serial port. Program auto-detects filters connected to computer. Quantum control software manages up to 4 Quantum filters simultaneously.

Faint whining noise changing in pitch/volume is normal

DayStar Product Number: .3QSE