TED Talks
Ted: Ted Ed: How to Take a Great Picture
For manual photography, the aperture, shutter speed, and ISO sensitivity can all be manipulated to get just the right amount of light. Carolina Molinari suggests the best exposure for an action photo, a stunning portrait, or a nighttime...
Khan Academy
Khan Academy: Understanding the Wet Collodion Process
The wet collodion process was a photographic process used to produce a negative.