http://www.pinholeresource.com
http://www.pinholeday.org
http://www.pinhole.com
http://www.mrpinhole.com
http://www.casadopinhole.com
http://www.zeroimage.com
http://www.geocities.com/pinhole_ring
http://www.andrewkemp.net
http://www.piotrzastrozny.com
http://utopia.knoware.nl/users/philippe