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65 LPI Small Ronchi Screen

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This is a quality 65 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 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.

65 LPI Ronchi gratings are best used in rough, preliminary testing of telescope optics

$9.75 each

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