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