Bertram Chrostar Exposure Meter
Manufactured by Ernest & Wilheim Bertram of Munich, Germany. The date is not know, but it is of an art-deco design and is attached to a gentleman’s fob. Seen in both a white and brown and in European or US versions, this one is brown and is the US version (showing film speeds in ASA instead of DIN)—it is also lightly stamped “US” on the bottom. It is a strictly reflective light meter. Opened up, the top cover has a dial to set the ASA or “Weston” value. This then aligns with a letter—A thru L—that is transposed to the set dial on the bottom. You read the light value on the meter needle and set this value on the dial across from the letter value. Then you simply pick your f-stop and shutter speed combination from the scale.