Lens Genealogy (Where did your lens come from?)

There is an article on the Canon Rumors website that discusses the lineage of camera lens.  The piece states that all lenses produced today can be traced back to six basic designs, four of which were produced prior to 1900! That is because modern lens designers don't start with a new design, rather they work to improve existing ones.

The article then describes in historical and technical terms the basic designs that have formed the foundation of all of the lenses we use today.  To read the article go to: Canon Rumors.