In this short article, I would like to start introducing the Hartmann test, beginning to describe the principles of operation, the merits and defects, paving the way for further developments and modifications to be able to easily use on the part of us amateur accomplishments during grattavetro. The Hartmann test was invented by Hartmann (1900) per
The pitch tool is an indispensable tool for polishing and parabolizing an a mirror telescope and is therefore useful to have a practical guide that tries to illustrate how to proceed to achieve it. First, it is good to have in mind all the steps necessary for its creation so as to proceed smoothly with the work, as a
In order to facilitate an excellent evening observing through a telescope, We know that this must be in perfect conditions of stability, and collimation and thermal equilibrium. This last issue will be analyzed in this post, to highlight what are the main parameters affecting the optics acclimatization time, the possible measures to improve the problem and
Support for the mirror, necessary for the proper positioning of the same during another test is not that any device able to keep it in a safe and in a vertical position. The support can be seen as the assembly of 5 distinct elements: Panel or carrier rear structure lower supports for the support of the
As regards the control of the optical mirror, simplest and most widely used tests, especially at the amateur level, It is definitely the Ronchi Test. This test uses a beam of light is transmitted and then reflected from the primary mirror, which is passed through a reticle with a series of low-frequency
When you run the Ronchi test, often there is found to have to do with the figures of the shadow lines that may be different from those that are usually presented to explain the most common defects in optical processing. Here you need a general method that can explain the behavior of any line
This post is meant to give information for groped to make things easier when trying to make the tool into pitch, necessary for the Bi phase and polishing parabolizzazione. Generally, when it is explained how to make the dough for the tool, there are hardly indicated the precise percentages for ingredients, but generally
Ronchi pattern
One of the tools needed to run the Ronchi test is the namesake grating. This is a series of opaque parallel lines spaced equally so you have a spatial frequency that can go from 4 all 8 per millimeter. A pattern with a lower frequency can be used if it is necessary to test
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