I wanted the sun to illuminate Fulking Escarpment and regions of the cloud, but I did not want the full glare of the sun causing lens flare or for the picture to become washed out. When the opportunity came, I created two exposures: one in which the sky was correctly exposed and the other exposing the landscape correctly. Using Adobe Photoshop CS4, I opened the first image and copied the second into a layer. After hiding the layer, I used the brush tool to erase the incorrectly exposed foreground belonging to the picture optimised for the sky, revealing the correctly exposed landscape underneath. I created a luminosity mask and a curves adjustment layer to lighten the image further, while protecting the highlights. I finished the picture with the application of the burn and dodge tools.
The Canon EOS-1Ds Mark II has a dynamic range of about 11 stops. The lighting conditions this afternoon were greater than 11 stops - I would say about 18 stops - necessitating the use of a 4 stop ND filter and advanced Photoshop techniques to create the picture you see above.