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While the Roddier test cannot be used when making the mirror, because it is applicable only to the finished optics and does not allow you to see what happens on the parabolic profile of the surface being processed.
Hi Guilio and thanks to you too for the welcome,you are definitely right , I forced myself not to make strange inventions and to follow and start with the focault even if I have seen various mirrors in autocollimation and it is true,they say where it is at fault without quantifying it.
I must tell you that the roddier is perfectly usable with the flat mirror in autocollimation with the use of the laser that simulates the star , I also verified the perfect correspondence with the response of the roddier with images taken with a star in the sky ,I talked about it at the lecture I gave at the high resolution meeteng UAI,i also have screenshots if you care.
The optics featured a 30nm spherical lens concentrated at 5.5cm from the outer edge ,matching measure both with roddier carried out on the sky and with roddier in the workshop.
What I aspire to would be to equip the mirrors I produce with this documentation, it will not be steep tomorrow ,but that is the intention.
Returning to the 305mm that I am making ,during the week I will prepare the pitch since I finished with the 800 passing at 10 hours of polishing
See you soon
MarcoHi Massimo and thanks for the welcome , I add in addition to what I have already written that the method that I have seen to be infallible several times is the roddier test also performed in the laboratory with a flat mirror ,this is why I am directed towards this methodology,the Roddier test ,if performed according to the canons , provides extremely precise parameters indicating exactly the value of any defect, this I verified with spherical errors that emerged on the sky and confirmed the laboratory.
What is certain is that at the moment this is difficult for me not having a flat mirror ,but it will come….Marco
