Dome slit is positioned to the north by lining up the two black marks, one on the dome, and the other on the north wall. Use the 'mf' OMICS command to position the telescope to piont at the dome flat.
The light source (except for the U filter) is the carousel slide projector located on top of the storage cabinet against the east wall. Turn on the projector to the "high" (brightest) setting, and position the projector so that the dome screen is fully illuminated. Covering the projector lens is a neutral density filter, which is left on the projector lens at all times. There should be a spare projector bulb sitting beside the projector; additional bulbs are located in the blue metal cabinet against the west wall.
DO NOT LEAVE ANY LIGHT SOURCE ON LONGER THAN NEEDED (saves bulb life.)
For the U filter, an ultraviolet lamp (looks like a portable, hand-held floodlight) is near the carousel projector. Turn the lamp on and wait several minutes for it to warm up. The lamp intensity will noticeably increase during this time. Position the lamp to give the best uniform illumination of the dome screen. Avoid looking at the UV light because prolonged UV exposure can cause eye problems.
There are several filters in the carousel tray to be used for flat fielding different CCD filters. For B and V (also any narrow band filters in this same spectral region), use the Kodak 80A (blue glass) filter. For R and I, use the KG1 filter (first of the "clear" glass filters - it is labeled on the edge of the glass.)
| Seconds | ADUs | Filter | |
|---|---|---|---|
| U | 180 | 10,000 | - |
| B | 60 | 14,500 | 80A |
| V | 30 | 14,300 | 80A |
| R | 5 | 11,100 | KG1 |
| I | 20 | 8,500 | KG1 |
| H-alpha | 30 | 5,700 | KG1 |
| O[III] | 60 | 5,000 | 80A |