graywolf wrote:
Why a brick wall. The grid of bricks allows you to see barrel or pincushion distortion very easily. You can see if all corners and the center are in focus at the same time. The rough edges of the bricks show how well the lens resolves macro-detail (Macro-detail is detail of a size that matters to your in your photographs. Who cares about how it does on something you can't see without a loupe?) I use slide film for these tests as I don't want to have them messed up by processing errors, if you can read negatives well that is ok, but prints are pretty much useless for testing. Pleae note that if all your lenses have pretty much the same problems that indicates, most likely, that there is something wrong with the camera instead of the lenses.
-- graywolf http://graywolfphoto.com
