What factors, besides sheer mirror size, are cited as equally important for high performance in ground-based optical astronomy?

Answer

Location (the dryness and stability of the atmosphere) and specialized technology like adaptive optics.

Performance is heavily reliant on environmental conditions, such as atmospheric stability and dryness at the observing site, as well as advanced technology like Adaptive Optics (AO) systems to correct for atmospheric blurring.

What factors, besides sheer mirror size, are cited as equally important for high performance in ground-based optical astronomy?
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