>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?
If this is outdoors during daylight, TTL-BL works very well for adding fill as long as you put the camera in one of the Auto modes. I recommend P mode.
Then, both the flash and the camera will underexpose by several stops. So you have to compensate.
Use Camera EV to boost the exposure starting at about 2 stops. Increase or decrease to make the snow white.
Then, boost the Flash EC starting at about 2 stops. Increase or decrease to adjust the brightness of the subject's faces.
You may end up blowing out the snow, but that is only an indication that the scene is beyond the dynamic range of the camera and can't be helped. Blowing out snow often doesn't hurt the picture.