Dr Wohler Duomar 12x60
Mfr: Dr Wohler, Kassel, Germany
Date: circa 1950's
AFOV: ~75 degrees
TFOV: 110m at 1000m (~6.3 degrees)
Eye Relief: ~13mm
Prisms: high index porro
Serial Number: 1114
Dr Wohler is one of the lesser known binocular makers from Germany. The Duomar is a wide angle 12x60 model with good optics but not top build quality. The sample shown has very soft light blue coatings that rub away easily when cleaned. I found bubbles in some of the prism and eyepiece elements. I also found prism shields made of paper, though these could have been added by a previous owner. The eyepieces are of the Erfle type with a 2-1-2 configuration.
Despite the disappointing quality of construction, the Duomar provides decent wide angle views. The distortion is low, though there is a fair amount of field curvature and astigmatism at the edge as is expected for such a wide angle design. The exit pupils are round, but the image seems a little dim due to the old coatings. There is a slight to moderate amount of ghosting and off axis reflections.