Confusing Catadioptric Cassegrain Telescopes

There are many possible varieties of Catadioptric Cassegrain telescopes. Most of them attempt to save on the manufacturing cost by using spherical optics. Spherical mirrors rather than parabolic or elliptical or hyperbolic ones are much easier to make and less expensive. The same applies to lenses.
Here are several possible versions. I compare them with one another. However, my conclusion as to their performance is only valid for these particular examples and should not be generalized to all such scopes. For example, the Maksutov is a well-understood and quite effective design that nearly always produces a superb image despite the rare poor example shown in this video.
Here are my videos about these scopes individually:
Kenko 100mm Maksutov: • Kenko 100mm Maksutov
Spacia 100C: • Kenko Spacia 100C Tele...
Meade 2040: • Meade 2045 Classic Tel...
Vixen VMC95L: • Vixen VMC95L Telescope
My video about the C5: • C5 Classic Telescope
There are also several versions of Catadioptric Newtonians including Jones-Bird telescopes like the Comet Chaser. Most of them are a horrible mutilation of the original design where they move the corrector from the secondary to the inside of the focuser. This saves the manufacturer a lot of money. One common example is the Jason Comet Chasers and similar scopes. The resulting toy is usually impossible to adjust and is a typical cheap piece of junk. But the CX150 and a maybe a few others implemented the original brilliant design properly. This is a very fine telescope! Manufacturers can take a nice optical design and make it into a very poor telescope.
Here's my video about the all spherical Jones-Bird Comet Chaser scopes. They are highly dysfunctional but still have a lot of charm in some iterations:
• Jason 76mm Comet Chaser
Here’s my video about the CX150: • Mizar CX-150
Another review of the Vixen VMC95L: www.scopeviews....
Rod Mollise has a superb guide to classic SCT telescopes: uncle-rods.blo...