Description
The Seco 72.5 HT Prism Assembly with Magnet is a mini prism made by Seco (part number 6703-012).
Its absolute prism constant is -17.5 mm, which is +16.9 mm on the Leica scale.
Specifications
| Model: | 6703-012 72.5 HT Prism Assembly with Magnet |
| Manufacturer: | Seco |
| MPN: | 6703-012 |
| Status: | Current |
| Height Offset: | 72.5 mm |
| Absolute constant: | -17.50 mm |
| Leica constant: | +16.90 mm |
| Constant source: | Dealer listing |
| Prism diameter: | 25 mm |
| Weight: | 340 g |
| Mount: | 5/8" Thread |
| Coating: | silver |
| 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 72.5 HT Prism Assembly with Magnet FAQ
Below is a list of frequently asked questions about Seco 72.5 HT Prism Assembly with Magnet.
What is the prism constant for the Seco 72.5 HT Prism Assembly with Magnet?
The absolute prism constant for the Seco 72.5 HT Prism Assembly with Magnet is -17.5mm. The Leica constant is 16.9mm.
Can I use the Seco 72.5 HT Prism Assembly with Magnet with a Leica instrument?
Yes, just set the prism constant to 16.9mm.
What is the height offset of the Seco 72.5 HT Prism Assembly with Magnet?
The height offset is 72.5mm.
