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Baader make a 2" amici prism diagonal, a good prism glass surface while expensive can rival a mirror, & the coating won't degrade.
Mirrors a flat & would be hard pin down -to collimate & adjust than a solid little glass prism, which has little screws pushing against it
The other point about an amici at high mags the glass ones can cause little degradation spikes on bright objects, like planets
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