Photography through the History

In this video I have furtherher explain the history of Photography which is intrigue one of the most fascinating one which one could ever explain. Explain this video in three different parts the first part is the normal introduction to the early for geography then the second part is basically the mediaeval period or the ancient for geography which used to exist between 1860's and the other part of the video I have explain the modern era Photography which mainly explains about the digital photographer the use of SLR and finally the DSLR.