DayStar Hydrogen Alpha T-Scanner Filters
DayStar Sub-angstrom Hydrogen Alpha filters 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 transmittance and increase contrast. The smaller the bandwidth, the higher the contrast between on and off/band light.
DayStar T-Scanner hydrogen alpha filters (like all non-heated narrow bandpass solar filters) are designed to operate best at an ambient 75 degree temperature with a tilt knob adjustment to accommodate 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.
DayStar hydrogen alpha filters require an Energy Rejection filter and work best at a focal ratio of approximately f/30. This focal ratio may be achieved using an aperture mask, a Barlow or TeleVue PowerMate, or some combination of the two. See the Energy Rejection Filters page for more information.
