when standing inside misty / foggy conditions, avoid using flash - same reason you are advised not to use headlights in mist / fog, all you would see is the reflection of the light on the mist / fog immediately infront of you.
when standing inside misty / foggy conditions, avoid using flash - same reason you are advised not to use headlights in mist / fog, all you would see is the reflection of the light on the mist / fog immediately infront of you.