DayStar Filters Combo Quark Hydrogen Alpha Eyepiece Руководство - Страница 5
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SCHMIDT CASSEGRAIN TELESCOPES:
SCT telescopes typically employ
a
front
mounted
Energy
Rejection Filter (ERF) with an
off-axis
opening
of
reduced
aperture.
Full aperture glass
ERF's
are
prohibitively
expensive and daytime seeing
quality limits resolution.
By reducing the aperture, the
focal ratio of your SCT will be
increased from the native focal ratio to the preferred ~F/30 beam.
Because the SCT has a central obstruction, we need to move the
opening off-axis. Now the beam that exits the SCT telescope is parallel
when it reaches the rear mounted DayStar Filter, but the light cone exits
the SCT off-axis. We must compensate for this angle with a wedge
adapter or the resulting transmission will be OFF-BAND.
The wedge
adapter has a machined internal angle which counteracts the off-axis
light. THE WEDGE ADAPTER MUST BE ORIENTED TO MATCH THE
ERF in order to achieve on-band performance of the Quark.
The SET SCREW orientation must MATCH the ERF HOLE
orientation.
How it works:
Light from the telescope enters the blocking filter, where wavelengths
near H alpha are transmitted while the rest are reflected back out. Red
H alpha light then passes through the Etalon. The Etalon passes a very
narrow range of light wavelengths, but it is sensitive to temperature and
light angle. In the Quark, the Etalon is heated to approximately 100-
150°F to control the wavelength passed, and the slow focal ratio of the
Questar telescope controls the angle of light entering the Etalon.
Care and cleaning:
While not in use, we recommend that users store the Quark with its end
caps on, in a climate controlled environment. The optical filter life
expectancy is extended up to 2-3 times by climate controlled storage.