Product Description
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.
Further details
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).