I don't really rate Wikis. It leads to diluted and unmoderated rambling content which is frequently technically inadequate, or just plain wrong.
I believe that TPF members are more than capable of working on a small passage which could be refined by others, but that an open model such as Wiki would just be incomplete and confusing.
If someone who is well versed in photography teaching would care to sketch a skeleton framework, then I'm sure there are plenty of volunteers to add meat to the bones (as it were). Deciding the format is a technicality - perhaps a Wiki style interlinked format would work well, but only when the information has already been prepared, not as an organic growth exercise.
Anyone understand me, (or even agree!)??
Rob