(for electronic flash), B (which operates at 1/60 sec. if the batteries fail, permitting some manual control in such a situation), and lock. Another camera ... The MX is a non-automatic SLR similar to the Pentax KX, and about the size of an Olympus OM-1. The most ... The head, mixing chamber, power supply, adaptor plates, and instructions for replacing the lamp housing are available for $147.50. YASHICAanbsp;...