Operate Pentax Spot Replacement Battery: Instructions for Optimal Analog Photography
To operate the Pentax Spotmatic, replace the battery with a Wein Cell MRB400 or a 4LR44 6-volt battery. To do this, remove the battery compartment cover with a coin. Insert the new battery with the + side facing the cover. Finally, secure the cover back in place to ensure proper operation of the light meter. … Read more