Description
The GeoMax-distributed GRZ101 360° Mini Prism with 1/4″ threads is a 360° prism made by GeoMax (part number 644327).
Its absolute prism constant is -4.4 mm, which is +30.0 mm on the Leica scale.
Specifications
| Model: | GRZ101 |
| Manufacturer: | GeoMax |
| MPN: | 644327 |
| Status: | Current |
| Absolute constant: | -4.40 mm |
| Leica constant: | +30.00 mm |
| Constant source: | Manufacturer documentation |
| Centring accuracy: | ±1.5 mm |
| Range: | ATR: Zoom95 manual: AiM 350 m, TRack 200 m |
| ATR / tracking range: | 350 m |
| Mount: | 12mm (Leica) Spigot |
| Equivalents: | Leica GRZ101 (identical, same article) |
| Last verified: | 21/10/2026 |
Sources
GeoMax-distributed GRZ101 360° Mini Prism with 1/4" threads FAQ
Below is a list of frequently asked questions about GeoMax-distributed GRZ101 360° Mini Prism with 1/4" threads.
What is the prism constant for the GeoMax-distributed GRZ101 360° Mini Prism with 1/4" threads?
The absolute prism constant for the GeoMax-distributed GRZ101 360° Mini Prism with 1/4" threads is -4.4mm. The Leica constant is 30.0mm.
Can I use the GeoMax-distributed GRZ101 360° Mini Prism with 1/4" threads with a Leica instrument?
Yes, just set the prism constant to 30.0mm.
