You've neglected to give any information about the make/model of flahsguns and camera.
Is it wired to your hotshoe flashgun or triggered by the activation of the flashgun? Obviously, the former method is preferable.
OnePlus 5T review: Hands-on
Illustrator Andrés Lozano on his improv line work, brazen use of colours & hand sketching
iPhone X review
Comment envoyer gratuitement des gros fichiers ?