Why did Herschel prioritize building his own reflecting telescopes?

Answer

Large refractors of the time suffered severely from chromatic aberration.

Herschel found that large refracting telescopes produced significant blurring of colors, limiting magnification effectiveness. By crafting his own mirrors, he circumvented this optical defect inherent in large refractors.

Why did Herschel prioritize building his own reflecting telescopes?
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