Thanks, Craig. I have spent a valued amount of time in Ron Reznik's ebook and it has really helped me understand exposure and luminosity. It is great to hear a comment that reinforces what I have learned.
Coke is a derivative of coal and burned at an extreme tempurature that allowed them to do certain things with iron ore. I sure am not much on mining history but anyways they are located on the allegheny trail near Babcock west va. here are a couple of pitures of what they look like.
Thanks to all for the comments.