The golden rule of lens adaptation is simple: You can adapt a lens to a camera body if, and only if, the lens's original flange focal distance is longer than the camera body's flange focal distance.
The difference between the two numbers determines the thickness of the adapter ring required. If the camera's flange is longer than the lens's, the lens would need to sit inside the camera body to achieve infinity focus—an impossibility without corrective optical glass, which degrades image quality.
| Mount Name | System Type | Flange Distance (mm) | Adaptability |
|---|---|---|---|
| Nikon Z | Mirrorless | 16.00 | Universal Receiver |
| Sony E (NEX) | Mirrorless | 18.00 | Excellent Receiver |
| Micro Four Thirds | Mirrorless | 19.25 | Excellent Receiver |
| Canon RF | Mirrorless | 20.00 | Excellent Receiver |
| Leica M | Rangefinder | 27.80 | Good Donor/Receiver |
| Canon FD | SLR (Film) | 42.00 | Donor (Mirrorless Only) |
| Canon EF | DSLR | 44.00 | Donor / Poor Receiver |
| M42 Screw | SLR (Vintage) | 45.46 | Excellent Donor |
| Pentax K | DSLR / SLR | 45.46 | Excellent Donor |
| Nikon F | DSLR / SLR | 46.50 | Universal Donor |
Note: Data provided for reference. Machining tolerances on cheap adapters can vary, affecting precise infinity focus.