Lenses

A Brief History of Nikkor Lenses
Product information on specialist Nikkor lenses and historical background.
http://www.mir.com.my/rb/photography/companies/nikon/nikkoresources/

First Generation of Minolta AF lenses
Outlined the original batch of Minolta AF lenses for worlds' first AF body integrated Maxxum (Dynax) 7000 SLR camera.
http://www.mir.com.my/rb/photography/hardwares/classics/maxxum7k/index6.htm

Lens Reviews
Includes buying advice, user reviews and photographs taken with specific lenses.
http://lens-reviews.com

The Macro Lenses Database
Technical data and product images for high-resolution macro lenses from manufacturers including: Carl Zeiss, Leitz, Nikon, Minolta, Olympus and Canon. Product comparison function provided.
http://www.macrolenses.de

MFlenses
A multi-language lens resource with performance reviews, a forum, photo gallery, used price guide and repair section.
http://www.mflenses.com/

Mirror lenses
A complete resource covering the photographic catadioptric and reflex lens with product specifications, user guides and techniques. Also includes lists of lens related items for sale.
http://www.mirrorlenses.co.uk

Photodo
Photographic lens specifications, guides, discussion, MTF test data and user reviews.
http://www.photodo.com

Photographic Lenses Tutorial
Optical facts for photographers covering focusing, apertures, bellows correction, depth-of-field, hyperfocal distance, diffraction, the Modulation Transfer Function and illumination.
http://www.graflex.org/lenses/photographic-lenses-tutorial.html

Red Book Nikkor
Product information about extreme high resolution Nikkor Lenses such as Ultra-Micro Nikkor, Repro Nikkor, Macro Nikkor, Printing Nikkor and other industrial-use Super Nikkor Lenses.
http://homepage2.nifty.com/akiyanroom/redbook-e/index.html

SLR Gear
Tests of digital SLR lenses with user reports, includes manufacturer's own brands and third party options.
http://www.slrgear.com