| 1 | A | B | C | D | E |
| --- | --- | --- | --- | --- | --- |
| 2 | Hubble Ultra-Deep Field - Observations |  |  |  |  |
| 3 | Camera | Filter | Wavelength | Total exposure time | Exposures |
| 4 | ACS | F435W | 435 nm | 134,880 s (56 orbits) | 112 |
| 5 | ACS | F606W | 606 nm | 135,320 s (56 orbits) | 112 |
| 6 | ACS | F775W | 775 nm | 347,110 s (144 orbits) | 288 |
| 7 | 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.