Technical information
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| The most used system is the Newtonian reflector invented by Sir Isaac Newton according to the drawing on the side. This system eliminated the refractors’ chromatic aberration, since the primary mirror reflects the light. The modern refractors are achromatics, but they can’t eliminate totally the cromatism. However the reflector mirror should be parabolic, since the spherical mirror has a great aberration, depending of the focal distance, that endangers the image. |
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foucault |
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"Tool" 16" pirex, f 4,8 for correction! |
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Before! central elevation, edge down, astigmatism,etc.... foucault, test ronki 100 lines |
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After!!! paraboloid !! (16" f-4,8) foucault test , ronki 100 lines Texereau!! métod ^ = 0,368 = 2,73=5,76 = 8,75 |
Plano convex lens
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Achromatic lens
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