Bottletopburly Posted July 6, 2017 Share Posted July 6, 2017 Has anyone a ronchi eyepiece ,are they any good /worth it ? Link to comment Share on other sites More sharing options...
Tweedledee Posted July 6, 2017 Share Posted July 6, 2017 Never tried one, but I've read that the Gerd Neuman version is a very good one to go for. Link to comment Share on other sites More sharing options...
Doc Posted July 6, 2017 Share Posted July 6, 2017 I have used one many moons ago. It was either my first or second star party and I borrowed one from a member from SGL to check my 16" dob. I think it was pretty easy to use, if I remember right you need to use it with a x2 barlow and look at a bright star with it. The view you get will show lines, as long as these lines are smooth and regular then your optics are OK. You need to know what you are looking at if there are irregularities in the image. Brantuk and Bottletopburly 2 Link to comment Share on other sites More sharing options...
Tweedledee Posted July 6, 2017 Share Posted July 6, 2017 2 minutes ago, Doc said: You need to know what you are looking at if there are irregularities in the image. I think the Gerd Newman version comes with a chart explaining exactly what each possible arrangement of lines tells you about the quality of the optics. Link to comment Share on other sites More sharing options...
Doc Posted July 6, 2017 Share Posted July 6, 2017 That would be great help Pete. As i said it was a long time ago and someone explained the lines, zones, and gaps to me but I cannot remember now. Link to comment Share on other sites More sharing options...
Tweedledee Posted July 6, 2017 Share Posted July 6, 2017 Some very comprehensive info here... http://www.bbastrodesigns.com/ronchi.html Link to comment Share on other sites More sharing options...
Bottletopburly Posted July 7, 2017 Author Share Posted July 7, 2017 I take its more use for checking mirror quality than checking collimation ? Link to comment Share on other sites More sharing options...
Tweedledee Posted July 8, 2017 Share Posted July 8, 2017 On 7/7/2017 at 10:36, Bottletopburly said: I take its more use for checking mirror quality than checking collimation ? It won't help with your collimation. Bottletopburly 1 Link to comment Share on other sites More sharing options...
philjay Posted July 11, 2017 Share Posted July 11, 2017 Never used one. They are for checking the figuring on your mirror, similar principle to the foucault test when polishing. A grating or knife edge gives a straight line, then if the reflections show up wonky then something is amiss Link to comment Share on other sites More sharing options...
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