| Mount | Specification | Flange Focal Distance |
|---|---|---|
| 10mm | M 10 x 0.5 thread | No standard |
| 12mm or S-mount | M 12 x 0.5 thread | No standard |
| CS-mount | 1 x 32 thread | 12.52mm |
| C-mount | 1 x 32 thread | 0.69 inches (17.52mm) |
| Leica mount (L) or M39 | 39mm x 26 threads/inch 60 deg | Originally 26.6mm but varies |
| 25mm mount | M 25 x 0.5mm | No standard |
| M42 mount | M 42 x 1mm | 45.46mm |
| T mount | M 42 x 0.75mm | 55.0mm |
| Canon (R, FL, FD) | Bayonet, 48.0mm | 42.0mm |
| Pentax (K) | Bayonet, 48.5mm | 45.5mm |
| Nikon (F) | Bayonet, 47.0mm | 46.5mm |
| Olympus (OM) | Bayonet, 47.4mm | 46.0mm |