DK did a test (that didn't included the 58 because it just came out) here you can read his results:bfitzgerald wrote:Sony changed the focal length used to make the GN look more impressive.
As said in reality the new 58 flash actually has less power than the old 56 one. And the 42 has only an increase of GN 1 over the older 36 model and not an increase of GN 6 as you might think.
http://tech.dir.groups.yahoo.com/group/ ... age/144821