⭕ OBSERVATION TELESCOPE
CARL ZEISS JENA
ASEMBI - D.F.12,20,40x8
Dimensions:Length = 62 cm, width = 22 cm, weight 8.5 kg.(23.5 L x 2.75 objective lens,50 lbs)
Flawless optics inside. No dirt, fog, fungus or
Cullet. Excellent, sharp viewing with exact
Collimation at all three levels of magnification.

Very rare pair of Carl Zeiss Jena Asembi D.F. 80x500 12x, 20x, 40x binoculars that are in very good condition for their age.
I dont know much about the history except the binoculars were purchased in Saint-Petersburg, Russia by my friend couple of years ago.



The Zeiss D.F.12,20,40x80 with the order word Asembi is a very rare and impressive binoculars of the highest quality. A top product from Zeiss, which described the first time already beginning was prepared from WW1.
Asembi model was introduced as an observation binocular in circa 1912. After World War 1 there were 2 versions of this model: The civilian Asembi and the military D.F. version (D.F. = Doppelfernrohr, always a marking of a military model). D.F has a graticule (reticle, Strichplatte) and this is typical of a military model and „normal for a D.F.
D.F Indicates Doppelfernrohr, oculars for both eyes. In this particular piece of equipment can be used with two persons simultaneously.
Below are some old photos where you can see Asembi in action objective some more details graticule (reticle, Strichplatte) overall look.

The Carl Zeiss 12-20-40x80 turret binocular (generally called Asembi) was used from WW1 and by the Kriegsmarine in WW2. The design remained largely unchanged, one of the few changes being that the air-spaced objective lenses were replaced by cemented ones in later models.

This Asembi is one of the latest series manufactured pre WW2. This is a modified version,
lenses are situated 8 cm inside the tube and has a mechanism for zooming lenses to make binoculars more compact and better for zooming.

The serial number is 13XXX with one of the highest known serial numbers of Zeiss Asembi Pre WW2.