Title: Tolerancias en el montaje de telescopios de dos espejos
Description: It is a series of spot diagrams showing the difference of the images given by a classical Cassegrain and a Ritchey-Chretien telescope.
The image is analyzed by sweeping the receiving plane through focus. Next is shown for both telescopes the coma due to misalignment of the secondary, and last an analysis is made of the aberration appearing when the distance between mirrors is not the correct. Also is discussed the volume of tolerable focus due to extra-axial aberration and defocussing.