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This is a list of websites where you can find and verify necessary information when adding lenses to the database. This list is regularly updated.
http://en.wikipedia.org – English Wiki. A lot of various information about lenses.
http://www.google.com/imghp?hl=en&tab=wi – Search for pictures on Google. The best way to find an image of a lens, MTF chart or optical design schematic.
http://flickr.com – Perhaps the biggest photo sharing site. Features many content-specific groups. Please add a link to such a group in the appropriate field when submitting a lens to the lens database at AllPhotoLenses.com.
http://mflenses.com - Very good site about manual focus lenses.
http://www.photodo.com - A large site about lenses, including older lenses. Offers a nice collection of MTF charts.
http://www.lensdatabase.net/ - Database of modern lenses.
http://www.photozone.de – Very good site with detailed test reviews of modern lenses.
http://www.kenrockwell.com – Detailed reviews and tests of modern and older lenses by Ken Rockwell.
Sites about individual brands and systems
http://www.canon.com/camera-museum/camera/lens/ - Canon Museum. Features almost all lenses produced by Canon. Features many lens’ optical design schematics. Unfortunately, no MTF charts.
http://www.usa.canon.com/cusa/consumer/products/cameras/ef_lens_lineup - Modern Canon lenses. Features MTF charts and compatible accessories.
Pentax, Asahi Takumar
http://kmp.bdimitrov.de - The most complete information about Pentax lenses from the 1970s.
http://whitemetal.com/pentax/index_pentax_lenses.htm - Site about Takumar lenses produced by Asahi Pentax.
http://www.aohc.it/lense.htm - Site about Takumar M42 lenses produced by Asahi Pentax.
http://www.taunusreiter.de/Cameras/Pentax_Main.html - Site about Takumar lenses produced by Asahi Pentax.
http://www.pentaxforums.com – Pentax forums where you can find information on a variety of lenses from this company.
http://www.nikonusa.com/Nikon-Products/Camera-Lenses/index.page - The official U.S. site full of basic information, including MTF charts and optical design schematics.
http://www.photosynthesis.co.nz/nikon/lenses.html - The most comprehensive source of technical characteristics on Nikon lenses.
http://asia.olympus-imaging.com - Olympus English site. Offers all sorts of information, including MTF charts and optical design schematics.
http://gavrilovart.ru/foto/olympusom/18-my-om1 - Descriptions of Olympus Om lenses.
http://olympus.dementia.org/eSIF/om-sif/lensgroup.htm - Descriptions, specifications, optical design schematics for Olympus Om lenses.
http://www.sigmaphoto.com/shop/lenses - Official English language site by Sigma. The most informative resource for this brand. Offers descriptions, specifications, MTF charts, optical design schematics, and information about accessories.
http://www.tamron.com/lenses/prod/70200_di.asp - Official English language Tamron website.
http://www.tamron.co.jp/data/old-lens/old-index.htm - Information about old Tamron lenses in Japanese.
http://www.tamron.co.jp/data/a2-lens/mflens.htm - Information about old Tamron lenses in Japanese.
http://lenses.zeiss.com/photo/en_DE/service/download_center.html - Detailed info about old and modern Carl Zeiss lenses in PDF format.
http://yashica.org/4-2-Lenses.html - Site about old Yashica lenses.
http://olypedia.de/Yashica_ML-Objektive_%285%29_-_Zoomobjektive - Good site about old Yashica lenses.
http://cybernetdenis.net/lenses.htm - List of lenses Konica AR. Brief characteristics. Photos.
http://www.buhla.de/Foto/Konica/eHexanonHaupt.html - The most comprehensive resource about Konica AR lenses. Reviews, features, photos, optical design schematics.
Sony A / Minolta A
http://www.dyxum.com/lenses/index.asp - Specifications and reviews for lenses by Minolta, Sony and other manufacturers. No optical design schematics or MTF charts.
http://www.mhohner.de/sony-minolta/lenses.php - Good database of descriptions for Sony and Minolta lenses.
http://www.sony.jp/dslr/lineup/lens.html - Database of the modern Sony A and Sony E lenses on the official Japanese site. In addition to technical characteristics, the site offers optical design schematics and MTF charts for all lenses.