Wetpixel recently published an excellent review comparing the Scubalamp D-Max strobe with the Retra Flash Pro. The review was compiled by Hannes Klostermann and Giacomo Rossi, who have provided a fantastic, thorough discussion of the pros and cons of both strobes. @Alex_Mustard and @adamhanlon discuss the review and its findings before noting and that it emphasizes how important independent reviews are for the underwater image making.
