The Schmidt-Cassegrain catadioptric is a variant of the Cassegrain; section of both mirrors is spherical while the optical path to the top there is a aspherical corrector plate surface, whose function is to introduce a quota equal to the spherical aberration produced by the same optics but a reflection of opposite algebraic sign. business models focusing is achieved by axial displacement of the primary mirror.
The strengths of these tools are compact (for the benefit of the frame and portability), the closed tube that reduces internal turbulence and the practical use of optics (f/10 or f / 6.3 depending on model) that makes This catadioptric suitable for all kinds of comments without excelling in any field.
The main drawback is the considerable obstruction caused by the secondary mirror and the lens hood on, which is directly responsible for some loss of contrast in fine detail. Moreover, the correction of spherical aberration - but satisfying - difficult to reach perfection.
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