By Harrie G. J. Rutten, Martin A. M. Van Venrooij
Explains why there are such a lot of other forms of telescopes and what every one sort has to provide
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Additional info for Telescope Optics : Complete Manual for Amateur Astronomers
E. '. - ....... -:- .. . :. . - . 250 Rays Fig. 5 mm Off-axis. ative intensity of parts of an image. Fig. 3, and, indeed, all such representations, under-represent the intensity in the brightest parts of the image. Fig. 4 shows the intensity distribution within the same comatic blur as a "three-dimensional" histogram of 25,000 rays. Note the intensity of the tail compared to that of the peak. If the detector has a threshold for response, as a photographic emulsion does, then the tail may not record at all.
The longitudinal aberration, or LA, is the difference between the intersection of the rays at the optical axis and the paraxial focus. In fig. 6, we present another type of graph of spherical aberration. Transverse aberration, TA, is shown for five intercepting planes. The graphs plot the distance from the ray to the axis for various zones of the entrance pupil in a specific plane. Because spherical aberration is symmetrical, graphs of longitudinal aberration are usually drawn for the upper part of the entrance pupil only.
For visual use of the telescope with an eyepiece, field curvature is, in most cases, easily compensated by the accommodation power of the eye. For visual use, it is usually not a problem. 2. For photographic use, the focal surface must be flat or flattened by means of a field flattener, or the film must be bent to conform to the focal surface. --- Fig. 1 Optical Layout of the Newtonian Telescope. 1 Introduction The Newtonian is the simplest and probably the most popular type of telescope for amateur astronomers.
Telescope Optics : Complete Manual for Amateur Astronomers by Harrie G. J. Rutten, Martin A. M. Van Venrooij