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Products are usually delivered in 3-7 days.
Products usually ready for pickup from Edmonton Warehouse between 2 and 3.
Discover your telescope anew – with the Baader Contrast Booster: Planeoptically Polished and Phantom Group Coated
A unique filter for many different astronomical tasks – incomparable in acuity to combinations of generic colour filters, made of raw polished glass – where surface inaccuracy adds up in the optical wave front to an unbearable degree. Especially designed to improve the beginners telescopes – to provide a professional replacement for the simple "dark green" Moon & Solar-Filters made of "raw polished" glass.
Note: For Solar Observation use only in combination with Baader AstroSolar Safety Film!
The transmission curve shows the light transmittance in percent versus the light wavelength in nanometres. Note the high transmission for visual observations of H-Alpha (98%), H-Beta (87%) and OIII (82%).
In a light polluted town or city mercury and sodium vapour street lights emit at 435nm and between 570-590nm. Here the filter transmission is between 0.3 and 3%.
The Baader Contrast Booster with integrated UV / IR cut filter is both an optimal filter for visual observations as well as for CCD images from light-polluted big city and metropolitan area.
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