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An eyepiece is placed in the telescope's focuser and used to project an image of the Sun onto a convenient flat surface.
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One method of solar observing that requires no filtration whatsoever is solar projection. Sky & Telescope photo by Craig Michael Utter. A surprising amount of detail can be seen with this setup. Seen here is a simple projection system made from a cardboard box with a piece of white paper as a projection surface. Small telescopes are especially suited to the solar-projection method. And don’t use a camera with a telephoto lens, even if the lens has photographic filters on it that appear to darken the Sun. While these may greatly dim the Sun’s glare, invisible radiation may get through and damage your eyes. But while welder's glass provides satisfactory naked-eye views of the Sun, its poor optical quality makes it unsuitable for use with binoculars and telescopes.įilters that are not safe, though sometimes recommended in error, include smoked glass, stacked sunglasses, crossed polarizing filters, neutral-density camera filters, metallized candy wrappers, and compact discs. Although welder's glass imparts a green hue to the Sun, one of these economical filters might be all you ever need for casual observing. This safe filter material is available at any welding-supply store (check your yellow pages for a local dealer) in convenient 4-inch-wide pieces that allow viewing the Sun with both eyes. 14 arcwelder's glass is the traditional choice. You don't need a telescope to observe the Sun all that's required is an appropriate filter, and a piece of No. Most observers prefer shades 13 or 14 the solar image through a shade-12 filter is uncomfortably bright. Welder's filters of shades 12 through 14 are popular and safe solar filters easily obtained at welding-supply outlets.