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133 LPI Large Ronchi Screen

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This is the hard-to-find 133 LPI Ronchi grating with the equally-spaced black lines taking up 50% of the area. It is mounted in a wide-open 60 mm x 60 mm medium-format slide holder for protection and ease of use. The outer dimensions measure 2.75" square.

This quality Ronchi screen is produced on high-resolution, high-contrast film to give sharp, solid lines so you can get the best readings possible when testing your telescope mirrors.

$12.75 each

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