No. | Focus with Aldis Back Lens | Canera Extension at Infinity | Plate covered sharply at full aperture | Comments | Source | |||
Duo | Trio | Duo | Trio | Duo | Trio | |||
Ins, | Ins. | Ins. | Ins. | Ins. | Ins. | |||
1 | 10 | 10 1/4 | 8 x 5 | 20 | ||||
2 | 11 1/2 | 8 3/4 | 11 1/2 | 8 | 8 1/2 x 6 1/2 | 6 1/2 x 4 3/4 | 20 | |
2a | 12 3/4 | 9 3/4 | 12 1/4 | 8 3/4 | 10 x 8 | 7 x 5 | For Series II to from F/12 with Duo and F/9 with Trio | 20 |
3 | 14 1/2 | 11 | 14 1/2 | 10 | 11 x 9 | 8 1/2 x 6 1/2 | 20 | |
4 | 17 | 13 | 17 | 12 | 12 x 10 | 10 x 8 | 20 | |
6 | 9 | 8 1/2 | 6 1/2 x 4 3/4 | 20 | ||||
6a | 10 | 9 1/2 | 8 1/2 x 6 1/2 | 20 | ||||
7 | 15 | 11 1/2 | 15 1/2 | 10 1/2 | 12 x 10 | 9 x 7 | For Series III to form F/16.5 with Duo and F/11 with Trio | 20 |
8 | 18 | 18 1/2 | 13 x 11 | 20 | ||||
9 | 22 | 23 | 17 x 13 | 20 |