OK I think I figured it out. I downloaded by sub exposures and I looked at the exposure times for my "blank" frames. They were 1/10 of a second... the good ones were 60 seconds, as expected. I could clearly hear the shutter opening and closing on my bad frames, and it was just as long a duration as the good ones. Clearly some sort of software thing going on here.
I searched the forums and came across
this topic this topic
and they symptoms sounded pretty similar to mine. After some persistent fiddling around and a little luck I'm pretty confident that I figured out the problem.
I need to set "Force Bulb" to "OFF", and "Mirror Lock" to "0".
I was able to reproduce the problem, and I also learned that once the system exhibits that failure mode, I need to restart everything to get it working again.
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I'm running Astroberry on a Rpi3b with generally good results. My camera is a Canon DSLR, and I frequently have an issue with blank frames. Tonight, for example, when I am using the capture module every other frame is blank. The good ones are good, but every other one is blank.
I sometimes see a similar issue when focusing, or plate solving. Sometimes restarting Ekos resolves the issue, but not this time.
Does anyone else get blank frames?
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