View source for Focotar - 1 1:4.5 / 50 mm.

[[Image:LFE.jpg|190px]] [[Image:17675.jpg|190px]]

*'''Production era''' - 1970-1974
*'''Code names''' - DOOHF, '''17581A''' known as LFE ~ Large Front Element
*'''Manufacturer''' - Schneider Kreuznach
*'''Lens''' - Five element Gauss design, with three elements before the diaphragm. It has larger diameter front and rear elements than the 16781R and 17582 designs.
*'''Mount''' - M39 x 1/26"
*'''Maximum diameter''' - 42 mm
*'''Weight''' - 131-135 g
*'''Accessories''' 
**DOORX ('''17675X''' or '''17675''' shown) and DOOUM - M39 x 15 mm extension tubes 
**Ser.VI adapter-ring '''14160''' (not shown)
*'''Aperture range''' - 4.5 /5.6 /8 /11 /16 - GERMANY
*'''Inscription''' -  LEITZ WETZLAR - FOCOTAR 1:4.5 /50 (all on barrel)
*'''Forum discussion'''
**[http://www.l-camera-forum.com/leica-forum/darkroom/258301-focotar-4-5-50-diagram.html]
 
== Focotar - 1:4.5 / 50 mm Schneider Serial Numbers ==

{| class="prettytable"
!SN Start
!SN End
!Product
!Year
!Total
|-
| -11458893||unknown-||50 mm f/4.5 Schneider (DOOHF)||1970-72||unknown
|-
| -unknown||12364598-||50 mm f/4.5 Schneider (DOOHF)||1972-74||unknown
|-
|TOTAL||ASSIGNED||SERIAL NUMBERS ||1970-74||unknown
|-
Serial numbers compiled from known lenses