Can this fix motion blur in old photos?

Mild blur can improve, but severe motion blur has physical detail loss that no tool can fully restore.

Should I use 4x on old portraits?

Use 4x only when you need larger output size. For clarity alone, Focus Restore is usually better.

Yes with balanced settings. Always review at normal viewing size, not only extreme zoom.

Fix blurry old photos by recovering gentle edge definition without making vintage portraits look artificial.

Old scans are often slightly out of focus and low contrast. Recompression during sharing adds additional softness.

Use Focus Restore first. It is tuned for moderate blur where real structure still exists.

Avoid multiple enhancement passes on the same export. Reprocess from the original scan for cleaner final quality.