Here is my entry - just in time:
Scene 1: Very high contrast, clear sunny day in the garden
I placed my models in the shade of a large pine tree with the sunlit garden in the background and fired a shot in Auto mode. The result was predictable, the light on the faces are too dim and flat, the highlights are blown and the foilage looks fluorescent:
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/183
f5.0 1/60 ISO 100
I then activated my Bowens 500ws strobe fitted with a 100cm Lastolite Umbrella Softbox. As the sunny area metered 1/160 at f11, I set my strobe to give f11 under the chin of the model
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/184
The result is much improved, rich saturated colors in the background, blue sky and a warm light on the models.
The warm light is cause partly by setting the camera white balance on flash while using a softbox that reduces the color temperature with about 800K
Scene II - The Beach
Next, I decided to go to the beach to look for another background.
Arriving late in the early evening, I found that the sun was low in the sky and casting a huge reflection on the surface of the quite calm water. Shooting in the direction of the sun was not desireable
About 45 degrees from the sun (of the North - West facing beach), the sky was a uniform light blue with a slight white haze low over the horizon. No nice fluffy clouds to add interest.
I decided to turn 180 degrees and use the nicely illuminated forrest behind the beach as a backdrop. With the sun low, the forrest and dunes get a nice textured look and the light is obviously warmer than at noon.
With a still strong sun in the background argumented by a wide and strong water surface reflection there were lots of light on the background, and placing my model in direct sunlight would cast some ugly shadows on her face - and a very long, unattractive shadow from her body.
This pictures gives an impression of the conditions.
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/178
Rather than attempting to balance a small diffuser in my left hand taking pictures with my right, I looked for natural shade and found it behind a long boathouse.
I placed my model on a small dune close to the boathouse making sure that her entire body was in shade and took the first picture in aperature mode with an exposure compensation of -1/3 stop to reduce the risk of over exposure:
The dune had some pretty flowers adding some color to the picture, but more importantly, effectively reduced the visible shaded area to a few feet behind the model. This was important for the following flash shot.
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/179
1/80 at F 8.0.
The image did not turn out too bad, the low sun had a lot less power than at noon (where there would be no shade here anyway). There are no blown highlights in the background or sky, but I don't like the contrast and low saturation. The light on the face of my model is too flat too.
I then set up a 500WS Bowens strobe fitted with an umbrella softbox - placed a little more than 2 meters from the model, on the axis towards the sun.
The sunny background metered f9.0 at 1/160 (ISO 100). I set the strobe to give f9.0 under the chin of my model at took the second shot:
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/180
The result was much better. The flash gave me a perfect exposure of my model and balanced the visible part of the shade with the background light.
Had I placed the model on a flat area, there would have been a much longer shaded area behind her, out of reach of the flash. Moving her back towards the end of the shade would have put her face in direct sunlight.
Finally, I added a bit of saturation in Lightroom before exporting the final image:
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/181
I was delighted to see that the EOS 5D did handle the shot in Aperature mode with no flash so well, having enough dynamic range to cover both shade and highlights.
My final observation: You don't always need an expensive, pro strobe set with light modifiers - at close range, the 5D + 580ex handles fill flash very well.
The last image of my daughter on the beach - with her face in direct (evening) sunlight shows no bad shadows or specular highlights:
http://www.prophotoresource.com/gallery/p17_sectionid/16/p17_imageid/185
1/400 f8.0 ISO 100, Exposure Compensation -2/3
Regards
Michael B. Hansen