Nick,
Great suggestion about the manual. L-558 has lots and lots of modes, so manual is essential to have read.
http://www.sekonic.com/images/files/L-558Eng.pdf
In fact, it is such a complex meter (or is that "fully functioned"?) that I just noticed (after using one for a year or so) and having read the manual several times that it will do reflected flash metering. Go figure! Thanks for pointing out that feature.