Hubble Ultra-Deep Field
Observations

Camera
Filter
Wavelength
Total exposure time
Exposures
ACS
F435W
435 nm
134,880 s (56 orbits)
112
ACS
F606W
606 nm
135,320 s (56 orbits)
112
ACS
F775W
775 nm
347,110 s (144 orbits)
288
ACS
F850LP
850 nm
346,620 s (144 orbits)
288

Question: How many filters were used on the camera on the Hubble Ultra-Deep Field, and what were the wavelengths that the filters focused on?
Answer: Four filters were used on the ACS, centered on 435, 606, 775 and 850 nm.