Description
The Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism) is a monitoring prism made by Topcon and also sold under the Sokkia brand (part number 724814).
Its absolute prism constant is -25.0 mm, which is +9.4 mm on the Leica scale.
Specifications
| Model: | L-Bar Mini Prism |
| Manufacturer: | Topcon |
| MPN: | 724814 |
| Status: | Current |
| Absolute constant: | -25.00 mm |
| Leica constant: | +9.40 mm |
| Constant source: | Manufacturer documentation |
| Dimensions (W × H × D): | 90.5×90×28 mm |
| Prism diameter: | 25 mm |
| Weight: | 210 g |
| Maximum range: | 1,200 m (Up to 800-1200 m; minimum 1.5 m) |
| Mount: | M8 adapter thread |
| Coating: | Silver |
| Last verified: | 21/10/2026 |
Sources
Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism) FAQ
Below is a list of frequently asked questions about Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism).
What is the prism constant for the Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism)?
The absolute prism constant for the Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism) is -25.0mm. The Leica constant is 9.4mm.
Can I use the Topcon 90º L-Bar Monitoring Prism (L-Bar Mini Prism) with a Leica instrument?
Yes, just set the prism constant to 9.4mm.
