Which instrument was designed with its own corrective optics built into its internal path, making it immune to the primary mirror flaw for its specific view?

Answer

WFPC2

The Wide Field and Planetary Camera 2 (WFPC2) was designed with corrective mirrors integrated into its internal optical train to neutralize the spherical aberration for its captured light.

Which instrument was designed with its own corrective optics built into its internal path, making it immune to the primary mirror flaw for its specific view?

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