Owlsight high noise for long exposure even with with gain=1

Raspberry Pi Cameras
1

  1. Where did you get the camera module(s)? -
    Amazon US

  2. Model number of the product(s)?
    ov64a40

  3. What hardware/platform were you working on?
    Raspberry PI Zero 2 W

  4. Instructions you have followed. (link/manual/etc.)
    Official Arducam wiki

  5. Problems you were having?
    The noise is very high for exposures of multiple seconds with libcamera-still even when setting gain=1

  6. The dmesg log from your hardware?

  7. Troubleshooting attempts you’ve made?

  8. What help do you need?
    Is there a way to lower the ISO further to capture very long exposures with less noise? (10s+)

Attached example of this run
libcamera-still --mode 4624:3472:12:P -o dbg.jpg --vflip=1 --hflip=1 --gain=1 --framerate=0 -n --immediate --autofocus-mode manual -t 0 --denoise cdn_hq --width 1920 --height 1080 --lens-position 3

noise
noise1920×1080 521 KB

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2

Hi,
Thank you for reaching out.
We’re actively checking the problem you posted. I’ll update you here if we make any progress.

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