Hartmann test

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

What is the optical test "of Caustic".

Is’ born in 1939 and it serves to measure with extreme precision (impossible to Foucault test for reasons which we shall see here later looking at the title: REASONS WHY THE FOUCAULT TEST IS INACCURATE FOR LOW FOCALS RATIOS MIRRORS)) the radii of curvature of the zones of a parabolic mirror, or even more deformed figure from, a very short focal ratio (that is more inferior to F5) and a beyond the diameter 300 or

Cooling telescope mirror

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