From Leica Wiki (English)
- Production era - 1935-1959
- Type - Adjustable extension legs and clamping ring for Elmar (I) f= 5 cm 1:3.5, Elmar (II) f= 5 cm 1:3.5 or Summar f= 5 cm 1:2 , with stops and markings for 1:1, 1:1.5 and 1:2 used as copy stand or for measuring distance and size for close-up work.
- BEKUR - similar for use with 3.5cm Elmar, with clamping rings, M. 1:1.5 Elmar 3.5cm, M. 1:2 Elmar 3.5cm, M. 1:3 Elmar 3.5cm.
- BEOOY - is similar with longer legs.
- Preceded by - BEVOR 1931-1932, BEMAR and BESOT 1933-1934.
- Superseded by - BOOWU /16511 1959-1970 and BOOWU-M (later BOWUM /16526) 1956-1976 for A4, A5 and A6 paper sizes and M-cameras - and the sturdy BEOON.
- Reference - Page 43 and 44 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus
- Forum discussion