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Original Prisms

Maximum accuracy and range
The range of a prism results from, among other things, its coating and the glass geometry. A number of Original prisms from Leica Geosystems have a special coating on the reflective surfaces – the Anti-Reflex Coating, and a copper coating on the reverse side. Without these, the range of distance measuring, ATR and Powersearch would be reduced by up to 30%. The workmanship and the durability of the copper coating are decisive for a long life. The glass dimensions, the position in the holder and with it the areal orientation, are important for measuring accuracy. Leica Geosystems prisms are manufactured from glass of the highest quality and furnished with optical coatings so that even under the most extreme environmental conditions, a long lifetime and maximum range of the highest accuracy can be achieved.
Transparent Choice
The optimal prism for your application

Leica Geosystems offers a transparent selection of prisms in various sizes for different areas of application. These are standard prisms, special prisms, mini prisms as well as monitoring prisms.

  The prisms distinguish themselves through a centring accuracy of under 1mm and the best possible beam deviation of < 2" to achieve the maximum range.   Optimised for common operating distances, these prisms exhibit a beam deviation of up to 8" The special working of the optical coating, unique on the market, provides an above average lifetime.   Despite its attractive cost-performance ration, the 1000 series fulfils the strict Leica Geosystems process controls as well as users’ high demands regarding lifetime.
  • Standard Reflectors
    For the most common applications. All prisms have an antireflex coating for to provide highest longevity as well as to minimize measurement errors in close ranges
  • Special Reflectors
    For highest precision with ingenious technology such as a precision metal housing, or those with carbon fibre strengthened prism axis.
  • Mini Reflectors
    High value, small format prisms for highest accuracy at close to medium range.
  • Standard Reflectors
    All-rounder prism with integrated target plate for standard applications.
  • Special Reflectors
    Optimised for long-term monitoring applications. The special anti-condensation construction with a patented filter guarantees reliable measurement ranges in difficult weather conditions. Choice of high-precision reflective tapes.
  • Mini Reflectors
    Easy to handle and light to transport mini prisms.
  • Standard Reflectors
    Round prism with optional target plate.
  • Special Reflectors
    Optimised for monitoring applications with high demands on the relative measurement accuracy. Robust metal bracket for simple and flexible assembly.

Centring Accuracy
Measurement errors occur if Original prism holders are not used. Substitutes are not configured according to Leica Geosystems criterion and often exhibit displacement between prism, holder and recording pin. The holder and the prism constitute a unit with which the centring and repeat accuracy is defined. The smallest dimensional change in the geometry of a glass prism or on the holder can lead to a deviation from the centring axis and thereby create measurement errors.

The beam deviation of a prism defines the its maximum range, according to the principle "entering beam should equal the exiting beam". The smaller the beam deviation (measured in angle seconds), the greater the directly reflected signal strength to the sender optic. The returned signal quality defines the maximum range of a measurement.

In contrast to many conventional prisms, the reflective copper coating on the reverse side of  Original prisms consists of a  support coating, a vacuum-metallised copper coating, a protective coating and an overlying coat of lacquer. The special adhesive lacquer protects the underlying layers from corrosion and detachment. Working together, the copper coating and the lacquer increase the life of the prism significantly. An additional anti-reflex coating on the sensitive front surface of the prism provides a tough resistance to scratches. The production  process of these coatings is so complex that only a very few manufacturers worldwide meet the requirements of Leica original prisms.

Measurement Accuracy
Measurement errors occur frequently at close ranges when prisms without anti-reflex coating are used, as the front of a prism always directly reflects a certain percentage of a signal.  Errors occur in the use of prisms without copper coating on the back side when moisture droplets accumulate or the prism becomes foggy. Leica Geosystems therefore uses either the stated reflective coating or a patented system for the prevention of fogging and condensation.