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    Schmidt Cassegrain Telescopes

    General properties of Schmidt-Cassegrain Telescope

    Very popular Schmidt-Cassegrain telescopes are reflecting telescopes with a unique Schmidt corrector lens which eliminates aberrations

    The tube of this type of telescope isn't very long, but because of the unique folding of the light, the focal length can be pretty long. 

    Corrector type on Schmidt Cassegrain telescope

    Schmidt corrector is a thin, aspheric lens used to correct the light paths – all light is brought to the same focus. The aspheric corrector lens is located at the focus or near the focus of the primary mirror. 

    Schmidt Cassegrain Telescope

    Design of Schmidt-Cassegrain telescope. (Available from:http://www.vikdhillon.staff.shef.ac.uk/teaching/phy217/telescopes/phy217_tel_catadioptric.html. [accessed 29 Oct, 2019] )

    Path of the light in Schmidt-Cassegrain Telescope

    • The light enters the tube through the corrector lens and reflects from the primary mirror, which is located at the other end of the telescope.

    • Once reflected, the light travels to the secondary mirror.

    • From there, it passes through a small hole in the primary mirror to the eyepiece.

    Space observations and astrophotography with Schmidt Cassegrain Telescope

    Schmidt-Cassegrain telescopes are great for lunar and planetary viewing. They can also be used for “deep-sky” observing and astrophotography.

    Compare to refractors, they feature large apertures at reasonable prices. They are easy to use, very compact, and portable.  

    A short presentation of the Schmidt-Cassegrains telescope is available here

    Slideshare presentations of Schmidt-Cassegrain Telescope

    Short Presentation | Schmidt-Cassegrain Telescopes | Optics Trade from Optics-Trade

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