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85 LPI Small Ronchi Screen

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This is a mid-range LPI Ronchi grating with the equally-spaced black lines taking up 50% of the area. It is mounted in a standard 35mm-size slide holder for protection and ease of use. The outer dimensions measure 2" 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.

85 LPI Ronchi gratings are good for intermediate testing.

$9.75 each

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