I've done some research on old photos and the oldest studio I have to date is 1884. Photo's were taken long before that and in different mediums. If the photo is mounted on a card with the photographers name on it there is a book available at http://globalgenealogy.com/ by Glen Phillips titled the Ontario Photographers list (1851-1900). Volume 2 covers 1901 to 1925. I have found them in libraries so it's worth checking there. Oher than that http://www.acay.com.au/~gsm/photo-dates.html http://www.ajmorris.com/roots/photo/pg.htm http://genealogy.about.com/od/photos/ all have information which may be usefull to you. I hope this helps. Good luck Jim