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Цена
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Light Pollution Filters 2"

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629[1]5
629b
Цена: 64,00 лв
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Описание

These contrast-enhancing anodized aluminium, optical glass filters are
designed to block out the wavelengths of light emitted by mercury-
vapour light and other common causes of light pollution,
whilst providing higher transmission at critical hydrogen-alpha and
hydrogen-beta lines than competing filters. Bright, light-polluted
skies appear much darker, and the contrast between object and sky
is improved significantly. This contrast-enhancement effect is
particularly apparent on nebulae. Unlike stars, emission nebulae
give off light in a very narrow range of wavelengths. These filters
allow maximum transmission of the important wavelengths of
H-alpha, H-beta and doubly ionized oxygen - the ones most
commonly emitted by nebulae. Views of galaxies and star clusters
are also enhanced, but to a lesser degree. Also improves contrast
on reddish planetary detail. Works well in telescopes of all
apertures but is highly recommended for use on smaller telescopes
up to 114mm diameter, where conventional filters swallow up too
much light. Available in two sizes, threaded to fit either standard
1.25" or 2" astronomical eyepieces. Supplied with storage case.

 
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