This handy new accesorry will give you major help to check the quality of nearly any scope you´re coming along in the future!
Basically all abberations of an optic can be seen in a Star Test, but this requires very steady air and lots of experience by the observer!
Compared to the Start Test the Ronchi Test works also with medium air and also a Beginner will be able to do a correct Analysis of an instrument after a short period of learning!
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theoretical ronchigramm of a perfect telescope
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The Ronchi eyepiece
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Purchased parts package:
The Ronchi Eyepiece consits of a mainbody made of black anodized aluminium with an 1,25" shaft. In the inside there is a small piece of glass with aon 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 analyse! This Ronchi eyepiece is equiped with a 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 an protective housing with a short manual in english and german.
- The Ronchi Eyepiece can´t be found at my current pricelist. The price is EUR 38,20 incl. 19% german VAT.
- I can send you the manual in german or english as a PDF file upon request
