Original Optivisor DA:7
Original Donegan OptivisorHead Magnifier DA:7
Madein USA
| Item No. | Focal Length | Magnification |
| DA-2 | 20″ | 1.5 times |
| DA-3 | 14″ | 1.75 times |
| DA-4 | 10″ | 2 times |
| DA-5 | 8″ | 2.5 times |
| DA-7 | 6″ | 2.75 times |
| DA-10 | 4″ | 3.5 times |
Original Donegan OptivisorHead Magnifier DA:7
Madein USA
| Item No. | Focal Length | Magnification |
| DA-2 | 20″ | 1.5 times |
| DA-3 | 14″ | 1.75 times |
| DA-4 | 10″ | 2 times |
| DA-5 | 8″ | 2.5 times |
| DA-7 | 6″ | 2.75 times |
| DA-10 | 4″ | 3.5 times |
