Okay, I've been reading through the info posted recently about incident metering, and I get it. But what do you do when you need to use fill-flash? I have Nikon gear with an SB-28 flash, so if I meter manually with an incident meter and set my camera accordingly, what do I do with my flash? Do I have to manually set it for distance? I usually use the TTL-metering on aperture priority. I don't like using strong flash, but sometimes a bit of fill is necessary in shadow, or to get catchlights in the eyes. Any advice would be greatly appreciated.