The DOT has 9 digital cameras and 1 analog camera. Of these, 7 are science cameras, each for a different filter, described at the DOT website. These filters can be used at the same time, and allows images to be taken at different wavelengths to be compared. Furthermore, some filters are tunable, allowing observers to take images at several points in the spectral lines. The DOT also has two full-disk cameras, of which one is analog and can only be used for guiding, while another one is digital and has a tunable Halpha filter in front of it. The last camera has a phase-diversity prism in front of it and is used for focussing.

The next informations displays the filter and camera names for all of the digital cameras.

List of cameras
Number Computer Camera Filter
1 scott KP-F100 Calcium
2 virgil KP-F100 G-Band
3 alan KP-F100 Blue Continuum
4 gordon KP-F100 Barium
5 john KP-F100 Barium Continuum
6 parker ES4020 Red Continuum
7 tintin ES4020 Halpha
8 beaker KP-F100 Halpha FullDisk
9 penelope KP-F100 PDFocus

The cameras should be placed in the right focus position according to the values obtained with the focus calibration procedure.

Restarting camera machines

Occasionaly, a camera machine will lock up. The most likely cause is that a fibertransceiver unit stopped working properly. The second most likely cause is the framegrabber card in the camera computer losing signal lock after a transient error in the fiber transception. It is also possible that the Ethernet connection has stopped working, or the computer has crashed altogether.

The symptom is either a red error message in the GUI, or its status is still green, but the camera image is clearly corrupt or not showing updates anymore. In case of the ?PD Focus or FullDisk cameras, the IDL pd_focus program or the guider is showing a black image (although his can also happen if you are pointed away from the Sun, or exposure is set too low).

The solution is: