By Harrie G. J. Rutten
Explains why there are such a lot of other forms of telescopes and what every one style has to provide
Read or Download Telescope Optics: A Comprehensive Manual for Amateur Astronomers PDF
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Additional resources for Telescope Optics: A Comprehensive Manual for Amateur Astronomers
Example text
Curved Field .. • Fig. 23 Spot Diagrams for the Simak with Three Apertures. 025 mm. To find the diameter of the spot diagram 20 mm offaxis, the designer can compute the size of the spot diagram 10 mm off-axis in the 200 mm system, then double it for the 400 mm system. We show spot diagrams in fig. 23 for the Simak instrument scaled to 150 mm, 200 mm, and 300 mm aperture, for both the flat and curved focal surfaces, in blue light, at off-axis distances of 10, 20, and 30 mm. With this design, we see that the linear size of the useful photographic field increases somewhat in the larger instruments, but that the increase is by no means proportional to the increase in aperture.
Longitudinal chromatic aberration expresses itself as color fringes on the optical axis. In chapter 21, we will show how this aberration may be corrected for a refracting objective. This aberration is usually shown by a graph of the focal position at various wavelengths relative to the focal position at a standard wavelength versus the wavelength. 2 Lateral Color Lateral color occurs off the optical axis, and is shown in fig. 18; the foci for various colors outside the optical axis simply do not coincide.
Optical glass manufacturers supply a large variety of glasses with a wide range of refractive indices and dispersions. 07 nm). Dispersion numbers Vd and Ve are based on the difference between the refractive indices for the F and C lines and the F' and C' lines respectively. 2) We will apply these formulae in chapter 21. Note that if the refractive indices at F and C are only slightly different, indicating a small rate of change of refractive index with wavelength, the Abbe number is large. 96; the Abbe number varies from 20 to 90.