Filters

The most useful filters are the UHC and O-III filters. If you only purchase one, get the UHC. A standard 31.7-mm (1.25-inch) filter sold for telescope eyepieces can be used with most large binocular eyepieces by merely holding it over the eyepiece. It is not ideal in this position, as it is designed to be placed near the focal plane, but it is certainly effective. If you have a binoviewer or a binocular telescope, then you obviously use them as intended. There is no need to acquire two—a good method of using it is to "blink" between each eyepiece, when the sought after nebula often becomes obvious. An O-III filter is especially useful for identifying those planetary nebulae that appear to be stellar at the magnification of the binocular.

Also useful, especially for solar eclipses and transits, are solar filters. These can be simply made from Baader Astro-Solar film to fit over the objective lenses. Solar-filtered binoculars are particularly useful for group viewing of solar phenomena (Figure 7.3).

Figure 7.3. Group solar observing with filtered binoculars.

Figure 7.3. Group solar observing with filtered binoculars.

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