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Kern 4x24

The Kern 4x24 was originally produced in the 60s and 70s as part of a military contract for the Stgw57, with production ending in the late 1980s. In the early 1990's SIG began converting remaining factory stock of these scopes to work with the Stgw90 by producing a compatible mount. Originally manufactured exclusively for the Swiss Army, some of these scopes were left over at the factory, and able to be sold to the general public - these units were serial numbered 140176 to 140275 - with 20 units having been converted by SIG/Leica for the Stgw90 were serial numbered 140278-140297 and are known as the ZF90.

Accessory wise GRD produced the objective lens rubber protector, accessories case, duster brush, and buckskin. There has never been any official commerical packaging for this scope, however WEZ KUNSTSTOFFWERKE did produce a carry case for the scope up until the mid 1970s.

(Above) Tritium cold cell that provides illumination for the reticle on the 4 x 24 scope. (Below) SG541 with 4x24 Kern

 

(Above and Below) Elevation adjustment drum

(Above) Windge drum (Below) Mounted to a Stgw57.

(Above) Click on digram to read individual descriptions of components.

Magnification
4x
Entrance pupil diameter

24mm

Exit pupil diameter
6mm
Distance of exit pupil
57mm
Twilight number
9.8
Field of view at 1000m
100m
Field of view in degrees
5.6
Diopter adjustment range
+- 3 diopters
Lateral adjustment
1/4 mil per notch
Lateral adjustment range
+-5 mil
Additional adjustment range
+- 8 mil
Elevation adjustment
1/4 mil per notch
Elevation adjustment range
up to 18 mil
Graticle illumination
T 0.9 Ci tritium cold light cell
Half life
T 1/2 8-10 years
Operating temperature range
-25C to +50C
Storage temperature
-40C to +60C
Weight
400g
Dimensions of standard version
Height
48mm
Width
50mm
Length
210mm / 285mm

 

 

Kern Reflex Sight

1
Aiming head.
Adjustable illumination of the reticle by the light collector, for use in low light conditions or at night (A)
2
Polorizing filter for continuous contrast adjustment (B), from light to fully dark (useful for aiming into the light).
3
The filter can be removed in low light conditions (dawn to dusk) to admit more daylight (C)
4
Azimuth correction for distance in 1/4 mil increments (E)
5
Mounting adaptors
STANAG (NATO), MP5, or Weaver mount
6
Protective cover
Dimensions (without adapter)
120 x 35 x 65mm
Weight
Approx. 250g
Optics

Aperature

20mm

Magnification

1x

Line of sight

71mm (STANAG Version)

Reticle diameter at 25m distance

Approx. 5cm
Maximum elevation in elevation and azmiuth
+/- 50 increments
Operating temperature range
-30 to + 60 C
Reticle illumination

Cold light source

Service life 8-10yrs

Photos and information courtesy Estes Adams and the SIG Parts Service (SPS).

Last Modified on April 25, 1999
aalbert@biggerhammer.net