About the reviews on this Web site
The tests on this Web site are not scientific and their sole purpose is to know better how a piece of equipment behaves, i.e. to know what you can expect from it while using it in the field, predict image quality outcome more accurately, or address any existing problems.
I only review and test the equipment that I personally own and/or work with on a regular basis. I do not review anything I have never held in my hands.
Nikon lenses (Nikkor) are tested using Nikon F6 and D70s bodies, Gitzo G1227 tripod, Kirk BH-1 ball head, and Fuji Provia 100F slide film. Test slides are then scrutinized on a light-table with a 10X loupe or, to post on this Web site, are scanned with Minolta Dimage Scan Elite II film scanner. Where necessary, scans are done at the highest resolution of 2820dpi. Scanning a full 35mm slide at this resolution and then setting the output, i.e. printing, resolution at 300dpi produces a photograph with the size of about 21X33cm, which is roughly a 9X enlargement. As I normally do not print photographs bigger than this, 2820dpi is enough for present purposes.
I normally test lenses for the following factors: sharpness, light fall-off, distortion, flare and ghosting, and bokeh. I consider other factors such as chromatic aberration (color fringing), etc. only if a lens demonstrates a visible problem.
Obviously, different people have different degree of tolerance towards different aberrations (in some cases and for some people, they might even be desirable!) depending on what kind of photography they do and how, as well as their personal preferences. If you read in a review that, say, distortion of such and such lens is really bad, it does not mean that it would necessarily look bad to you. It is important to see visual impact of each particular effect for yourself. Therefore, where appropriate I post test photographs so that you can see and decide whether a particular degree of such and such aberration would be acceptable for what you do and need.