I've bought a non-TTL Yongnuo flash (YN-560 IV) for my Canon 77D and it works fine when shooting through the viewfinder. However switching to Liveview mode, I found out that it annoyingly stops working. It is possible to get the flash to fire if I switch to high-speed burst mode, however in that case the flash fails to synchronize with the camera properly. Is there a way to force the camera to sync the manual flash properly?
I've read the answers to this related question, however my camera doesn't have a silent shooting mode, so they don't apply. Likewise the Canon manual says:
A non-Canon flash will not fire during Live View shooting.
However it obviously does if I switch to high-speed mode and the manual doesn't say anything about how to enable proper synchronization.
Answer
It is fairly obvious, both from the statements in the Instruction Manuals of practically every EOS DSLR ever made with Live View capability but without 'Live View Silent shooting' modes and from the actual user experience when one tries to use a manual flash that can't communicate its presence to the camera body, that Canon does not support using a flash which the camera cannot even detect is attached to the hot shoe in Live View mode with the non-LV Silent Shooting models. The reason none of the Manuals for the non-LV Silent Shooting models say anything about how to enable proper synchronization is because these cameras, as designed, are not capable of such synchronization with a third party manual-only flash.
What problem are you trying to solve that requires you to use a non-Canon manual only flash in Live View with your 77D?
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