The all-sky imagers that are used in the intensified all-sky cameras
are manufactured by KeoConsultants. Each imager has
telecentric and non-vignetting optics, and the field of view of the
fish-eye lens is 180 degrees. The filter wheel can accomodate seven narrow bandwidth interference filters. In normal operation one filter holder is left "free" to be able to acquire nonfiltered images. Every station has three filters: green, blue, and red.
The faint images are intensified before the final image is acquired by the CCD camera (B&W) and digitised by the frame grabber card of the station computer. This intensification allows shorter exposure times with less expensive CCD cameras, and typically an exposure takes 500ms.
Photographs (52kB,JPG) of the
imagers.
The operation of the imager is controlled by the station computer of
the all-sky camera station.
| ITEM | DESCRIPTION |
| Fish-eye lens | Canon 15mm/F2.8 |
| Additional optics | Telecentric lens elements |
| Filter wheel | 7-position filter wheel for 2" filters |
| Filters | Interference filters, wavelengths 557.7nm, 427.8nm, and 630.0nm (BW 2.0nm) |
| Intensifier lens | Canon 85mm/F1.2 |
| Image intensifier | Varo 25mm MCP Gen II Image Intensifier model 3603 |
| Reimaging optics | Canon 100mm/F2 |
| CCD camera lens | Fujinon 25mm/F0.85 |
| CCD camera | Pulnix 765E, 756(H)x581(V) |
