Image on right: The core of the grand design spiral glazy M100, as imaged by WFPC-2 in its high-resolution channel. WRPC-2's modified optics corrected Hubble's previously blurry vision, allowing the telescope for the first time to cleanly resolve faint structures as small as 30 light-years across in a galaxy tens of millions of light-years away. The image was taken on December 31, 1993.
Image on left: For comparison, a picture taken with a WFPC-1 camera in wide-field mode on November 27, 1993, just a few days prior to the STS-61 servicing mission. The effects of optical aberration in HST's 2.4-meter primary mirror blur starlight, smear out fine detail, and limit the telescope's ability to see faint structure.
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