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Home Telescopes Optical Tube Assemblies Celestron Optical Tubes Celestron C5 SCT XLT Optical Tube Assembly
Celestron C5 Schmidt Cassegrain optical tube assembly with 1250mm focal length XLT coated optics, supplied with a standard dovetail bar, eyepiece, 1.25 inch diagonal and finderscope.
There has been much said and written regarding the optics in the SCT. Essentially, the combination of a spherical primary, an aspherized secondary and a Schmidt plate (a thin glass plate, plano (flat) on one side, and with the Schmidt curves on the other), creates a wavefront that is free from Lower Order Spherical aberration (LSA), free from Higher Order Spherical aberration (HSA or zones), a diffraction limited field free of coma and astigmatism, and the field free of Chromatic aberration (CA).