CONTENT

This site states the following, "Quality, High-Resolution, High-Contrast Ronchi Screens." Our analyzers noticed that the web page also stated " While Foucault testing gives the builder of telescope mirrors a good quantitative look in specific zones on his or her glass, the Foucault test shows only half the picture." The Website also stated " In contrast, Ronchi testing goes a long way to show the optician a qualitative look at the mirrors curve. Each screen is secured in high-quality slide mounts in either the standard 35mm size or in the larger, wide-open 6 x 6cm. Ronchi Screens and Ronchi Gratings." The website's header had Ronchi Screens as the most important keyword. It was followed by Ronchi Gratings, Telescope Optics Testing, and 133 LPI which isn't as ranked as highly as Ronchi Screens. The next words the site uses is 85 LPI. 65 LPI was also included and will not be understood by search crawlers.