What drove William Herschel to begin constructing his own reflecting telescopes?

Answer

Dissatisfaction with the quality of commercially available instruments

Driven by a lack of satisfactory quality in existing instruments, Herschel took up the engineering practice of grinding and polishing his own mirrors for reflecting telescopes.

What drove William Herschel to begin constructing his own reflecting telescopes?

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Sir William Herschel -- "The King's Astronomer" | David Rives

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