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Optical coating is peeling off - I’ve seen similar on old pairs of my (coated) specs - the old pairs I keep in the garage.
Every optical coating has microscopic pinholes which allow molecules of water to get in between the coating and the glass substrate. While it may look great at first, the pinholes slowly grow with time inevitably (humidity) or made worse by well-intentioned but counterproductive cleaning with solvents - starting with water or anything else.
If you want the scope to last:
- best to keep in someplace dry with a cover that breathes;
- resist the urge to clean the corrector unless it’s absolutely necessary.
New corrector required, you have the link I sent previously. Celestron may also offer to supply a corrector.
FWIW I’m pretty sure Celestron and Meade SCTs are not matched sets - they slap together whatever comes off the production line, and they aren’t doing much of a quality check either - the average scope has p-v wavefront errors around 0.36 wavelength - not even ⅓ wavelength. Meade is a bit worse at 0.4.
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