Download E-books Telescope Optics : Complete Manual for Amateur Astronomers PDF

By Harrie G. J. Rutten, Martin A. M. Van Venrooij

Explains why there are such a lot of other kinds of telescopes and what every one kind has to supply

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6) indicated that larger correction of round aberration is bought with thicker menisci, yet that those be afflicted by worse lateral colour. so as to examine the impact of the axial thickness at the residual round aberrations, we designed correctors 10 mm via 50 mm thick for a 2 hundred mmfl3 Maksutov digicam. desk 10. three offers info for this digital camera with the several corrector thicknesses. those platforms usually are not optimized for minimal blur. Correctors thinner than 10 mm are tough to make with no springing or cracking them, whereas thicknesses more than 50 mm are too heavy. all of the 5 correctors was once separately optimized. it seems that because the thickness raises, the corrector will be much less strongly curved and in the direction of the reflect. From the graph of longitudinal round aberration proven in fig. 10. 7, it truly is glaring skinny corrector indicates massive aberration, yet that for thicknesses over 30 mm, the convenience from expanding the thickness is marginal. part 10. three: The optimal Meniscus Corrector one hundred and five Axial Meniscus Thickness (mm) ! 10 peak (mm) -0. 1 -0. 05 -0+ ~ LA(mm) Fig. 10. 7 Longitudinal round Aberration in a 2 hundred mm f/3 Non-concentric Maksutov digicam for numerous Meniscus Thicknesses. bankruptcy eleven The Maksutov-Cassegrain Telescope eleven. 1 creation of their papers released within the forties, Maksutov and Bouwers advised that the meniscus digital camera can be remodeled right into a Cassegrain process. however it was once no longer until eventually 1957, whilst John Gregory released his now-classic layout for the f/23 meniscus telescope which bears his identify, that those catadioptric tools grew to become on hand to amateurs (ref. eleven. 1). the first replicate within the Gregory MaksutovCassegrain is round; the secondary is an aluminized spot at the again part of the meniscus corrector. It, too, is round. just like the Schmidt-Cassegrain, the Gregory Maksutov is brief and closed, and provides solid colour correction and freedom from a spider. In 1958, Gregory more suitable the colour' correction of his unique layout, additionally making attainable anf/15 layout (ref. eleven. 2). within the f/23 device, all of the optical surfaces are round, yet within the f/15 process, both the corrector or the first replicate has to be aspherized to put off residual round aberration. within the years following, changes of the unique Gregory layout were released. This bankruptcy describes the Gregory Maksutov and designs that experience it, together with structures optimized for astrophotography, and evaluates their optical functionality in visible and photographic functions. As is our perform, all six tools have an aperture of two hundred mm. eleven. 2 Maksutov-Cassegrain structures Fig. eleven. 1 exhibits six consultant Maksutov structures on the similar scale. those six tools supply an outstanding chance to debate a big optical suggestion: levels of freedom. a level of freedom capability the facility to make a unfastened selection with admire to an optical parameter reminiscent of a radius of curvature, a distance among surfaces, a lens thickness, a pitcher kind, an aspheric floor, etc.

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