Gerd Neumann 10mm Ronchi Eyepiece - 1.25"

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Gerd Neumann 10mm Ronchi Eyepiece - 1.25"

Gerd Neumann 10mm Ronchi Eyepiece - 1.25"

This Gerd Neumann 10mm Ronchi Eyepiece accessory will help you to check the quality of nearly any telescope you come across in the future! While it is true that optical aberrations can be determined by the star test, this method requires steady air and an experienced observer. The Ronchi test is far less demanding: It works within medium air and even beginners will be able to do a correct analysis of an instrument after a short period of learning!

The Ronchi eyepiece consists of a metal body with a 1.25" shaft made of black anodized aluminum. It holds a tiny piece of glass with a grating on it. Some gratings from other manufacturers are made of exposed film or laser printouts: Those gratings will show inferior contrast and will be much more difficult to analyze! This Ronchi eyepiece is equipped with vacuum metalized chrome on glass grating with 10 lines per millimeter. The grating is on the telescope side of the glass and is exactly in the same plane as the outer stop. The Ronchi eyepiece is shipped in a protective case with a short manual in English and German.

Gerd Neumann Product Number: 10-101-150

Additional Information

ManufacturerGerd Neumann

Questions & Answers

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  • For what types of telescopes can your Gerd Neumann 10 mm Ronchi eyepiece be used on? Reflectors? Refractors?, and/or Cassegrain compound scopes? Thanks!

    Hello Jim, I spoke to Gerd himself by E-mail and according to him, this eyepiece can be used on any optical system be it refractor, reflector, or cassegrain.

  • Hi, Do the 10 lines/mm include black and white lines? I ask because I've seen ronchi pieces advertised with a high line count only to find out that they were counting both types of line and it therefore really only had half the amount of lines. So is doe

    The manufacturer is slightly unclear on this, but I think with the information I have found that the answer is that the grating has 10 grating lines per mm (otherwise known as 10 line pairs per millimeter), but when properly used in a telescope you should

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