Q

Illustrations and extensive description of the items listed below can be seen in Dennis Laney's definitive Leica 1984 Accessory Guide courtesy of Mike Butkus

Leica Code	Description	Production Year	Remarks
QBOOE	Yellow filter no. 3 dense; screw-on type H	ca.1935	NY item
QCPOO	Yellow filter no. 3 dense; slip-on type A36	ca.1931	NY item