Here's an interesting story from Upworthy. "Why didn't people smile in old photographs? It wasn't just about the long exposure times."

"If you've ever perused photographs from the 19th and early 20th century, you've likely noticed how serious everyone looked. If there's a hint of a smile at all, it's oh-so-slight, but more often than not, our ancestors looked like they were sitting for a sepia-toned mug shot or being held for ransom or something. Why didn't people smile in photographs? Was life just so hard back then that nobody smiled? Were dour, sour expressions just the norm?

Most often, people's serious faces in old photographs are blamed on the long exposure time of early cameras, and that's true. Taking a photo was not an instant event like it is now; people had to sit still for many minutes in the 1800s to have their photo taken.

Ever try holding a smile for only one full minute? It's surprisingly difficult and very quickly becomes unnatural. A smile is a quick reaction, not a constant state of expression. Even people we think of as "smiley" aren't toting around full-toothed smiles for minutes on end. When you had to be still for several minutes to get your photo taken, there was just no way you were going to hold a smile for that long.

But there are other reasons besides long exposure times that people didn't smile in early photographs." ... for the answer check out the article 

"Why didn't people smile in old photographs? It wasn't just about the long exposure times.

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