Yes you can bring it.
People used cameras on phones, but I'm not sure you'll be allowed full-on photography.
I didn't have an issue when I saw Grim Reaper and Dokken there. You should be ok just keep the flash off, it tends to be annoying to the performers! Enjoy the Metal Church show, hope it rocks!
Should be ok.
I agree shouldn't be a problem
Never had an issue with cameras. They may just say no using the flash at most
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