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I have a Canon Speedlight 380EX and some time ago it stopped syncing correctly. Every photo I take comes out dark as if the flash didn't fire. The flash fires, the IR assist beam works as intended and the E-TTL indicator is on. Tried with two cameras (40D and 70D) with same results.

Is it misconfiguration issue, or malfunction in the flash?

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That is an older flash. originally designed for EOS film cameras. Although it has E-TTL, it is probably not worth repairing since you can replace it pretty cheaply.

http://www.usa.canon.com/app/pdf/support/380EX20110907.pdf

You can test it by setting the camera to M with a long shutter speed like 1 second. Keep increasing the speed to see if it fails and where.

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  • \$\begingroup\$ Older but works just fine with modern EOS cameras. \$\endgroup\$
    – ysap
    Jul 26, 2016 at 12:19
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Your shutter speed must not be higher than 1/125s or it won't be able to see the flash light.

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    \$\begingroup\$ The flash sync speed isn't 1/125s for those cameras... \$\endgroup\$
    – Joanne C
    Apr 27, 2016 at 10:27

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