• Large blocks of time on the Subaru telescope were set aside for the repeated measurements of several "deep fields"
• The main goal was to study extragalactic objects: high-redshift galaxies, using colors and narrow-band filters to estimate redshifts, and supernovae and AGN, by finding objects which varied in brightness over time
• Each area was observed 10-20 times over a span of 5-6 years through a variety of filters, detecting objects down to magnitude i' ~ 26
• These datasets provide just what we need to look for proper motions among faint stars in the Milky Way

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