What is the crowd's opinion of Gradual Camera?

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That's probably a hardware restriction.

This is definitely not what you want but my app Gradual Camera has a mode that simulates long exposure, but it doesn't preserve the quality: https://play.google.com/store/apps/details?id=com.coffree.gradualcamera

I think the longest is still less than 10 seconds but I think I could extend it if you were interested.