Scans of codex Sinaiticus.
The following scans are screenshots of the facsimile index of Sinaiticus at the Center for the Study of New Testament Manuscripts, to which many thanks for making this facsimile edition available online.
Romans and Corinthians.
Galatians, Ephesians, Philippians, Colossians, and Thessalonians.
Hebrews, Timothy, Titus, and Philemon.
James, Peter, John, and Jude.