Website Links
Here are some links that I have found useful. Do not take what is found at the other end of these links on face value. This of course goes for any published material, books included. Before taking information to heart one must verify by experience or by cross checking with other sources.
Some care is needed here. There are opinions and tests. The main issue is interpreting the sample images and test results. The prevailing conditions and photographers capability affect the sample results. For the tests there is no assurance that the tests have been executed without error.