Description
The Seco 360 Prism (Leica-compatible) is a 360° prism made by Seco (part number 6406-01).
Its absolute prism constant is -11.3 mm, which is +23.1 mm on the Leica scale.
Specifications
| Model: | 6406-01 |
| Manufacturer: | Seco |
| MPN: | 6406-01 |
| Status: | Current |
| Height Offset: | 86.0 mm |
| Absolute constant: | -11.30 mm |
| Leica constant: | +23.10 mm |
| Constant source: | Dealer listing |
| Weight: | 600 g |
| Centring accuracy: | ±2.0 mm |
| Maximum range: | 600 m (600 m (2,000 ft), conditions not stated) |
| Mount: | 5/8" Thread |
| Equivalents: | Leica GRZ4 (Leica +23.1 mm) |
| Last verified: | 21/10/2026 |
Notes:
- The prism constant comes from a dealer listing and has not been confirmed in manufacturer documentation. Check the label on the prism before relying on it.
Sources
Seco 360 Prism (Leica-compatible) FAQ
Below is a list of frequently asked questions about Seco 360 Prism (Leica-compatible).
What is the prism constant for the Seco 360 Prism (Leica-compatible)?
The absolute prism constant for the Seco 360 Prism (Leica-compatible) is -11.3mm. The Leica constant is 23.1mm.
Can I use the Seco 360 Prism (Leica-compatible) with a Leica instrument?
Yes, just set the prism constant to 23.1mm.
What is the height offset of the Seco 360 Prism (Leica-compatible)?
The height offset is 86.0mm.
