While observing other photographers using v-flats, I would say most use them in two different ways. Here are the five most common ways to use a v-flat.
Photographer Jeff Carpenter (Readylight Media) along with V-Flat World goes through five common ways to use a v-flat in this video. For these demonstrations, Carpenter shows how he uses them for some portraits with model Allee-Sutton Hethcoat. While Carpenter is showing these different ways using strobes, many photographers use them in similar ways with natural light.
While the methods are used often, I would say the first two methods are probably the most used. These are just using the v-flat to bounce the light for fill with the white side and to subtract the light with the black. One thing to keep in mind is the distance of the v-flats from your subject and how that affects your lighting just like anything else.
If you find yourself in a location that doesn't have a solid white or black background, you could use the v-flat to fill that need. Maybe the location does have a white or black wall, but it's not close to the window that's your light source; well, you could use the V-flat in that scenario.
Out of five different methods, probably the least common out of the bunch is using the v-flat to help evenly light the background.
Which way do you find yourself using v-flats the most? Are there any other ways you use them not covered in these five most common ways? Leave your answers below.
All photos used with permission of Jeff Carpenter.