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Hi Mark,
There aren't any "real issues" with the coatings. They are about 12 years old and it's probably about time the mirror was re coated. There is nothing wrong with them. If you didn't have another reference scope beside it, you wouldn't pick the coatings for older ones.
It's a combination of both factors. The enhanced coatings offering a slight brightness increase over standard and Andrew's older standard (non damaged) coatings being down a fraction on what a freshly coated 20" would deliver.
Cheers,
John B
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