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Model: 10101151Brand: Gerd Neumann
Generally In Stock, Please Confirm Before Ordering
"Since I first offered my Ronchi eyepiece a couple of years ago, many customers asked for a way to take images of the Ronchigramms: This is now possible with the new version!"
The Photographic Ronchi has the same high-quality grating inside, which is made of evaporated chrome on polished glass. (254 Lines per inch or 10 Lines per millimeter). Contrary to the visual version it has no 1,25" barrel but a T-thread on one side an M52 on the other. With the T-thread you may mount the photographic Ronchi on nearly all instruments. (Matching adaptors are already owned by most amateurs.)
On the other side of the Ronchi you may install your camera with a normal lens installed at the M2 thread. (You might need a matching Step-Ring for your lens.)
The surface of the grating is in the same plane as a outer rim, so the focal plane of any instrument can be found very easy!
The new photographic Ronchi may be used visually too without any restrictions. .
This handy new 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!
Purchased parts package:
The Ronchi eyepiece consists of a metal body with a 1,25" shaft made of black anodized aluminium. 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 analyse! This Ronchi eyepiece is equipped 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 a protective case with a short manual in English and German.
Available in both a 5mm/L and 10mm/L grating. Please select your choice from the drop down box above. The image shows the 10mm/L version for illustration purposes only.
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Rother Valley Optics
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