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Hi Gary do you know how to make a couder mask. Google couder mask program follow yhe links to download a program that will automatically print a mask for you. You will need this mask to reach your final paraboloid figure. If you are not sure just email me. The measurements that you take using the focault test alone may not be sufficient to get better than a 1/4 wave. There is also ronchi for windows. Use this meausurement 6mm or -6mm outside ROC . Make sure that it is four lines only. Print the figure cut out only the 2 centre lines. Trace the outline onto the mirror with a texta. put the mirror on the stand to test and get the centre of ROC, measure back 6mm and check to see if the patterns match. If they do then you are pretty close to what you want. All you have left to do is to measure shadows with the couder mask and you are finished. If this is not so clear let me know and I'll explain it again.
Regards Cristian
Last edited by cristian abarca; 21-06-2006 at 09:45 PM.
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