Catadioptric Telescopes

Catadioptric telescopes use a combination of mirrors (reflection) and lenses (refraction) to create an image within your eyepiece (or camera). This process allows for less distortion and higher focal length in a compacted telescope. Their heavy weight and compact size make this telescope ideal for astrophotography, especially if you’re needing a very narrow field of view.

These telescope types employ various different image correction techniques to eliminate aberrations and image-warping within the field of view.

The most common types of catadioptric telescopes are:

Schmidt-Cassegrain

These telescope types have a ‘flat’ front lens where the main corrections take place at the primary mirror with minor corrections continuing along the path to the apex.

Maksutov-Cassegrain

These telescopes almost always have a visibly curved main ‘negative’ lens at the opening of the scope whereupon the path light is corrected upon entering the OTA with minor corrections continuing along the path to the apex.

For more technical or detailed information about any of these types of scopes, view any of the sites below for more information:

Wikipedia; Catadioptric System:
https://en.wikipedia.org/wiki/Catadioptric_system

Wikipedia; Schmidt-Cassegrain Telescope:
https://en.wikipedia.org/wiki/Schmidt–Cassegrain_telescope

Wikipedia; Muskatov-Cassegrain Telescope: https://en.wikipedia.org/wiki/Maksutov_telescope#Maksutov.E2.80.93Cassegrains

Starizona; Schmidt-Cassegrain Telescope:
https://starizona.com/acb/basics/equip_telescopes_scts.aspx

Starizona; Muskatov-Cassegrain Telescope:
http://starizona.com/acb/basics/equip_telescopes_makcass.aspx