Solar Spectrum .2A Hydrogen-Alpha Filter

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Brand and Model:Solar Spectrum .2A Hydrogen-Alpha Filter
Price ($USD):$3750
Filter Position:
un-checked .96" un-checked 1.25" checked 2"
un-checked Visual Back un-checked Full Aperture
Description:The Solar Spectrum .2A hydrogen-alpha filter consists of a filter housing, Thermal-Electric Controller (TEC), converter and AC power cord.
The TEC is in a gold metallic housing that maintains a constant temperature on the filter. There is a small muffin fan mounted over a set of metal fins. The fan/fin combination allows you to cool off the filter when the sun's energy heats the filter too much or if you want to observe a different region of the chromosphere.
Heating the filter brings it "on-band" and allows you to tune into the Doppler shifted phenomena on the sun. If a prominence or filament is on the side of the sun heading towards you, you then lower the temperature of the filter to view the " blue wing". Similarly, heating the filter can show you the "red wing" of the sun.
Temperature adjustment is accomplished by pushing the "Sel" button on the control unit then holding the up or down arrows to the desired setting. The setting moves rapidly. Moving the temperature 9 degrees C equates to a 1 angstrom shift. It takes about 30 seconds for the filter to completely change temperature.
The control unit plugs into the AC to DC converter and then into an AC power source. You can also run the filter off of a 12VDC battery. A fully charger battery lasts 3 hours.

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