The Auto Bellows is a precision close-up device with continuous magnification range. Both automatic and manual exposure control is available when used with the AE Prism Finder. It permits a wide range of magnification depending on the lens used (up to 2.42X with the 80mm lens reversed).
It features rack and pinion base rail, and revolving mount for turning camera horizontally or vertically.
For maximum magnification, lens may be reversed using the supplied Lens Reversing Ring. Camera mounting ring and Lens Reversal Ring included.
The following chart illustrates the 80mm f/2.8 lens in the normal position. Lens may be reversed as well for some applications with the use of the Reversing Ring.
645AFD II Auto Bellows close-up table for 80mm f/2.8 lens
Actual Extended Distance (mm) Bellows Extension Distance (mm) Magnification Subject Distance (mm) Area Covered (mm) Exposure Factor
60.0 0 0.75 146.8 74.8 x 55.4 1.6
64.1 4.1 0.80 141.1 70.0 x 51.9 1.7
80.1 20.1 1.00 121.1 56.0 x 41.5 2.0
96.1 36.1 1.20 107.7 46.7 x 34.6 2.3
112.2 52.2 1.40 98.2 40.0 x 29.6 2.5
128.2 68.2 1.60 91.0 35.0 x 25.9 2.7
144.2 84.2 1.80 85.5 31.1 x 23.1 3.0
160.2 100.2 2.00 81.0 28.0 x 20.8 3.2
176.3 116.3 2.20 77.4 25.5 x 18.9 3.3
180.0 120.0 2.25 75.5 24.9 x 18.5 3.4