Bob Atkins is probably the most complete and in-depth source of information regarding Canon lenses and digital camera optics. This site has reviews of Canon and Canon-compatible lenses with detailed quality and performance measurements. There are also numerous comprehensive articles explaining optics and how they work on digital cameras. While the Bob Atkins concentrates his equipment reviews on Canon cameras, the optics and technology articles are applicable to all brands of digital SLR cameras.

 

www.bobatkins.com/photography

This site is devoted to Minolta A-mount DSLR cameras and related components. It may not say much about the cameras themselves, currently the Konica-Minolta Maxxum 7D and Konica-Minolta Maxxum 5D only, but it has a catalog of nearly every Minolta A-mount lens ever made, complete with detailed specifications, pictures, review links, information links and user-reviews. As Konica-Minolta DSLR users feel uncertainty towards the transition of A-mount DSLR cameras to Sony, Dyxum is bound to become an increasingly important site. This site is recommended for people wanting additional equimpement for their KM digtial SLR cameras.

 

www.dyxum.com

SLR Gear, from the makers of Imaging Resource, is an entire site mostly devoted to lens reviews of all major manufacturers. Presently. there are very few actual lens reviews posted on SLR Gear. Lens reviews posted include very nice interactive charts for blur, chromatic aberrations, distortion and vignetting. Unfortunately, SLR Gear's nice technical reviews are hidden among hundreds of non-scientific user reviews which are difficult to compare.

 

www.slrgear.com