What instrument was physically replaced by the WFPC2 during the first servicing mission?
Answer
Wide Field/Planetary Camera (WF/PC)
One of the primary hardware changes executed during Servicing Mission 1 was the physical removal and replacement of the original Wide Field/Planetary Camera, often abbreviated as WF/PC. This instrument was substituted with the newly developed Wide Field and Planetary Camera 2 (WFPC2). The WFPC2 represented the internal correction strategy for wide-field imaging; unlike COSTAR, which corrected light externally before it entered certain instruments, the WFPC2 incorporated its own precisely shaped internal mirrors designed specifically to counteract the 2.2-micrometer error present in the main mirror as the light entered that particular camera unit.
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