I just had my shutter stick open, I was able to get it working again but how do I prevent it from happening in the future.
I was shooting with a 70-300mm lens on a 10 second exposure.
As an addendum any other maintenance tips would be appreciated
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You can probably prevent this problem by making sure your battery is fully charged. Stuck shutter (or probably, stuck mirror) is a common symptom of low battery, especially when taking a long exposure or using the flash. By the end of the exposure the battery doesn't have enough juice left to close the shutter and flip the mirror back. The other thing which challenges weak batteries is the self-timer. I've seen a situation where I could take a photo okay, but if I tried to use the self-timer, the camera would shut down with the mirror locked up.