change by distance - G-head de-focussed this table shows the change in light with distance in meters from the fop (FrontOfParabola) the Grafit A4 was set at 5.2 and the G-head was fitted with a diffuser glass click on a face to see an enlargement
distance 1 2 3 4 5 6 7 f-stop 22.7 11.8 11.4 8.06 8.01 5.66 5.62
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