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
SKU GN-10-101-150 Manufacturer Gerd Neumann Optical Design Ronchi Barrel Size 1.25" Eyepiece Field of View - Apparent Info not provided by manufacturer Eyepiece Focal Length 10mm Eyepiece Eye Relief Info not provided by manufacturer Eyepiece Manufacturer Series Gerd Neumann Ronchi Special Feature None
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- Gerd Neumann 10mm Ronchi Eyepiece - 1.25"
- Questions & Answers
Product QuestionsFor what types of telescopes can your Gerd Neumann 10 mm Ronchi eyepiece be used on? Reflectors? Refractors?, and/or Cassegrain compound scopes? Thanks!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 does this piece have 10 black lines/mm?
ThxQuestion by: itz marcus on Apr 14, 2015 9:29:00 AMThe 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 see only 5-6 alternating pairs of lines (according to the instructions). The imaging version actually says 10 LP/mm and claims to use the exact same diffraction grating as this visual eyepiece, so it seems that this is the higher resolution figure.Answer by: Chris Hendren (Admin) on Apr 14, 2015 3:48:00 PM
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