"Photographing people in the snow with fill-flash"
I have a gig coming up where I may have to photograph people standing next to an ice-rink. The ice-rink may have a covering of snow. In any event it will be pretty white.
So. I am expecting my subjects to be underexposed if the camera meters for the overall scene.
So; I am thinking of using fill-flash. I am wondering if TTL or TTL-BL would be best? I think TTL-BL as this is outside. Is this right? Does anyone have any tips/advice - things to watch out for for example?