Ryan replied to the topic 'Canon 600D T3i "Failed to expose" error' in the forum. 4 years ago

Last year I had similar issues with a Canon 1Dx. I systematically tried changing settings, and my final settings are below. This was an earlier version of SM, but it is worth a try. Note that for the capture target I had SD card, the had Delete SD image checked. I still had the imaging sequence set to save to StellarMate, so no images were actually lost.

Main Control:
Mirror Lockup = 0 (It I set the mirror lockup on it would fail, and I would need to reboot the system and restart KStars on the Mac)

Options:
Force Bulb = OFF (Camera was set to Bulb mode, if I used Force Bulb it would fail)

Image Settings:
Capture Format = RAW
Transfer Format - Native
Capture Target = SD Card (I think this one was the key in the Image Settings tab)
SD Image = Delete

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