Mamiya Press Super 23
Users Guide
By using a set of five extension rings in various combinations between the lens-shutter assembly and the lens mount of the camera, it is possible to undertake close range and copying work.
When photographing is performed by using extension rings, without extending the swinging back mount on 6×9 cm size, the four corners of the picture sometimes become slightly cut off, depending on the type of lens or the number of extension rings. Cut off amount can be observed on the ground glass by stopping down the aperture.
When photographing with the 6×7 cm size, or when photographing with the swinging back mount fully extended, no cut off portions appear with any lens used. Extension rings cannot be attached to the 250 mm f/5 lens.
| Lens | Lens to subject distance | Magnification | Subject coverage | Exposure factor |
| 50 mm f/6.3 | 121/32" (42 mm) | 2.67 |
53/64×11/4" (21×31.5 mm) 53/64×11/16" (21×27 mm) | 13.5 |
| 65 mm f/6.3 | 213/16" (72 mm) | 2.12 |
11/16×19/16" (27×40 mm) 11/16×11/4" (27×32 mm) | 9.7 |
| 100 mm f/3.5 | 61/16" (153 mm | 1.46 |
11/2×21/4" (39×58 mm) 11/2×113/16" (39×47 mm) | 6.0 |
| 150 mm f/5.6 | 111/16" (281 mm) | 0.98 |
21/4×33/8" (58×86 mm) 21/4×23/4" (58×70 mm) | 3.9 |
The values in the table represented those when the five extension rings are attached, the lens distance scale is set at the closest distance, and the back mount is fully extended.
Lens to subject distances represent those from the front extremity of the barrel to the subject.
Subject coverage is the area of the subject registered on the focusing screen (21/4×35/16 in. 57×84 mm). The values in the upper lines of the column indicate 6×9 cm format; the lower lines designate 6×7 cm format.