|The StellaCam3 by Astrovid is a modified Watec 120N+ which uses the Sony ICX249AL sensor reading out 752 x 582 pixels in CCIR mode. With a separate control box, the camera can be commanded to integrate up to 256 frames and use shutter times down to 1/2000 s. The StellaCam3 has a built-in Peltier cooler. I simply recorded the video data generated by the camera via a PAL-to-USB converter (Conrad Electronics) and used VirtualDub to grab AVI files. For some reason I could not visualize individual even or odd fields with VirtualDub, so I used LiMovie which I happened to have on the PC for visualisation. For a screenshot, look here.|
The camera was used with a 50 mm Nikon lens f/1.4. The shutter time
was set to 1/2000 s. The analog signal was routed through the control box
of Rolf's time machine and the inserted time was compared to the LEDs.
Several AVI sequences were grabbed and the following table gives the data
for 8 fields as an example.
|Frame number (Run5.avi, 16 Aug 2008)||time inserter||Running light clock||Difference in ms|
|Average||40.5 +/- 0.5|
As measured before by G. Dangl, this Watec also shows a delay of 40
ms, i.e. the signal by the time inserter is inserted 40 ms after the actual