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Leica CPR105 (GPR105) Flat Prism/Reflector

Image of Leica CPR105


The Leica CPR105 Prism is a unique reflector provides two back-to-back flat , both with a 0 absolute constant (+34.4 Leica Constant).

It comes with 1/4” fitting, suitable for mounting on GLS105 reflector pole.



Height Offset:100.0 mm
Absolute constant: +0.00 mm
Leica constant: +34.40 mm
Mount:1/4" Thread


  • This prism is sometimes labeled as Leica GPR105.

Leica CPR105 FAQ

Below is a list of frequently asked questions about Leica CPR105.

What is the prism constant for the Leica CPR105?

The absolute prism constant (true value) for the Leica CPR105 is 0.0mm. The prism constant as defined for Leica instruments for Leica CPR105 is 34.4mm. For a more detailed explanation on prism constants please see this article.

Can I use the Leica CPR105 with a Leica instrument?

Yes, you can use the prism with a Leica instrument as long as you set up the correct prism constant in the instrument settings.

What is the prism constant value that I need to use with a Leica instrument?

In order to use the Leica CPR105 with a Leica instrument you should use 34.4mm as the prism constant value.

What is the height offset of the Leica CPR105?

The Leica CPR105 height offset is 100.0mm. This is measured from the mounting point to the centre of the prism.