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85 LPI Large Ronchi Screen

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This is a good mid-range 85 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.

The 85 LPI Ronchi grating is good for intermediate testing of telescope optics.

$12.75 each

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