Oes the availability of photographs significantly change what we can know about the U.S. Civil War?

The main question to address for Chapter 12 of Going to the Source, The Illustrated Civil War: Photography on the Battlefield, is the following:

12. Does the availability of photographs significantly change what we can know about the U.S. Civil War? If so, how? If not, why not?

Thesis and references from Going to the Source Chapter 12 required.

It is recommended to look through the questions for analysis on pp. 250-251 in Going to the Source, which should also prove useful in preparing for the discussion.