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Meade Series 4000 Photo-Visual Eyepiece Filter #25A RED (1.25

Meade's #25A red filter, with 14% transmission, does approximately the same thing as the #21 orange filter but does so with more effectiveness when used with larger-aperture telescopes.  It is useful primarily upon Jupiter, Saturn & Mars, but also increases the contrast between Mercury and bright blue skies during daylight or twilight observations.  It is only useful upon telescopes with apertures of 8.0" or larger.

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