[Elphel-support] Elphel NC353L long exposures
Eric Boudrand
dev at boudrand.net
Thu Aug 16 04:07:51 PDT 2012
Hello,
I have a question about night monitoring. Which lens do you use for
that ?
Regards.
--
Éric Boudrand
Le mardi 14 août 2012 à 16:37 +0300, Niko Lavonen a écrit :
> Hello,
>
> We here at Metsähovi Radio Observatory acquired an NC353L camera earlier
> this summer for all-sky monitoring of weather conditions. Overall we've
> been pleased with the camera, but there is a problem with long exposures
> we've not been able to figure out. It seems the camera won't do exposures
> longer than approximately 38 seconds. Is there a known limitation in the
> camera's hardware or software that imposes this limit? To get a view of
> the night sky, we'd very much like to have the camera do exposures for up
> to many minutes if needed.
>
> We've observed that when the camera reaches the "maximum" exposure time,
> it starts reporting that the exposure is 1/1000000 seconds, while it can
> be seen from the images that the actual exposure is still in the order of
> many sedconds. We've tried raising the AUTOEXP_EXP_MAX value higher than
> the ~38 second limit, but the camera won't go higher. We've also tried
> manually setting the exposure time to e.g. 60 or 120 seconds, but in
> these cases the camera has frozen. Our camera firmware version is 8.2.7.
>
> Regards,
>
> Niko Lavonen
> Research assistant
> Aalto University Metsähovi Radio Observatory
> Metsähovintie 114, 02540 Kylmälä, Finland
> e-mail: nlavonen at kurp.hut.fi
> Phone: 029-4424856
>
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