In catadioptric Maksutov-Newton the arrangement of the mirrors is very similar to the classical Newton but the primary mirror with a spherical section ; the principle of the optical path there is a meniscus corrector with both spherical surfaces , whose function is to introduce a quota equal to the same spherical aberration produced by reflective optics, but of opposite algebraic sign. The strengths of these tools are obstruction very small, the tube closed that reduces internal turbulence and the aplanaticità that conjures the presence of spherical aberration. On the other hand you can find something to do with considerable space in the presence of instruments of medium diameter.
A problem with these lenses can be represented by a long period of acclimatization heat mainly due to the thickness of the meniscus, manufacturers often make use of fans to speed the exchange of temperature.
Basically, these tools are very valid for observations of solar system objects so that as a contrast with rival the expensive apochromatic refractors , the separation of double stars and even occasionally the sky background objects, on the other hand have a very small illuminated correct field (mainly due to the small size of the secondary mirror), which can penalize the use of photography.
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