The Lens Price Database, Lens$db, has prices and physical specifications for over 400 lenses, including: all Canon EF prime lenses and EF Extenders; all Canon EF L-series zoom lenses, plus a few others; a large selection of “alternative” manual focus lenses from Carl Zeiss, Leica, Nikon, Olympus, Pentax, Voigtlander, and other brands; a variety of lenses from Sigma, Tamron and Tokina; and, a selection of Medium Format Mamiya 645 lenses that are more-or-less compatible with EOS cameras, and with the Mirex Tilt-Shift adapter. The prices are mostly for used equipment in excellent to mint condition, based on eBay sales and list prices at many camera stores.
it would be so much nicer if the Database could be browsed online (Search, graph etc).
There is a site that does that but only contains the data until 2010.
Excellent work, and I have consulted each of your databases from time to time. Believe me, I have some clue about the tremendous amount of work that goes into creating (and maintaining!) something like this.