The lighting was better, and I used a circular polarizer filter. I think this photo is better than the first one that I took. I also found out why the photo is loosing symmetry. There is a bend in the river, and the trestles left and right side are shifted from each other by about 3 feet. It appears to be part of the original construction because the concrete doesn't seem shifted from one side to to other.
- I think the biggest lesson learned is that I should have used the 17mm focal length instead of the 21 mm. The track looks longer and more impressive with the 17mm.
- I didn't find the exposure that I liked the best of the photos that I took. I think a graduated filter would work better than the circular polarized filter. (This is more of a hypothesis than a lesson.)