I asked him the info on what he used and this was his response, for any of you interested in photography:
"I use a Nikon D200 camera. Most of the pictures were taken with Carl Zeiss lenses and somewith my Nikon lenses. I only use two types of filters. One, is a polarizing filter that has, the same effect as your sunglasses do. It reduces glare, increases contrast and helps to enhance color saturation.
The other filter I regularly use is a "neutral density filter" (ND). I have a variety of ND filters to choose from depending on how bright the light is in a scene that I am trying to adjust. The ND filter serves to lower the intensity of the light in a certain part of the scene (usually it is the sky that is too bright). It has no effect on color or anything else, just lowers the bright area's down so that the scene is more evenly balanced for correct exposure.
FYI, our eyes are able to see 5 - 7 stops difference in exposure values. Thus, when we look at a scene that goes all the way from sunny parts to deep shadows our eyes are able to adjust for that variance and we see it. The problem is with photography is that both digital sensors, as well as film, can only record 3 stops of light intensity difference. Thus, taking pictures similar to the ones I sent you and not using a ND filter, you would end up with a picture where either the foreground is exposed correctly and the sky is washed out. Or, the sky is exposed correctly and the foreground is too dark to see much detail. With the ND filter lowering the brightness in one part of the scene to> more closely match the brightness in another part, you end up with a picture where you are able to see the detail in all parts of the photo. Other than those two types of filters, I use no in-camera or post photo manipulation of the photo's. The ones I sent you are the way they came out of the camera." - Ron Southworth