Lumenera SkyNyx 2-0M

The Lumenera SkyNyx 2-0M is a CCD camera with 640 px by 480 px, using a Sony CCD ICX 424 (1/3 "). It can be used both for high-speed planetary imaging or long-exposure imaging. It is read out via a USB interface. Lumenera itself provides a simple readout software which however does not allow saving time-stamped images. I used the Lucam Recorder to read the camera. It lets me grab image sequences in video rate or even higher (133 Hz for 320 x 200 pixel) and save each individual image as a FITS file with a time stamp in the header.

The camera was used with a Zeiss Flektogon lens, 35 mm f/2.8. The camera was set to an exposure time of 1 ms, sequences of 200 images were acquired and saved to individual FITS files.

Comparing the time of the running light clock and the FITS header for the 5 first and 5 last images in the sequence gives the following result:
 
Image number FITS header time Running light clock Difference in ms
1 18:26:19.632 0.615 17
2 18:26:19.648 0.630 18
3 18:26:19.663 0.645 18
4 18:26:19.679 0.660 19
5 18:26:19.695 0.675 20
196 18:26:22.587 0.566 21
197 18:26:22.603 0.581 22
198 18:26:22.618 0.596 22
199 18:26:22.634 0.613 21
200 18:26:22.650 0.627 23
Average 20 +/- 2

In conclusion, the time stamp in the FITS header is ca. 20 ms +/- 2 ms behind. Note that this is comparable to the 'delay' time given in TimeMemo when synchronizing the PC clock and in cannot be excluded that the PC clock has a systematic offset by these 20 ms. It seems that the time stamp the software gives to an image is really the time when the image comes into the computer.
 


Created by dvk,  26 Aug 2008.
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