Originally Posted by
resummerfield
I have the same 300 Imagon in the Compound 5. I computed the aperture opening at various f-stops, measured this diameter, and marked it on a paper scale opposite the aperture pointer. I then attached that paper scale over the metal scale.
But then I thought of another way—I used a Minolta Booster to measure the readings on the gg center, compared against a 300 Sironar-S. I used a tight-fitting dark cloth, the light was stable, and the readings were consistent from start to finish. Using the meter readings, the aperture pointer on the Imagon had to be closed down about 1/3 stop more than the computed settings on the Imagon to get the same f-stop as the Sironar. Wide open, the Imagon was about f4.5 without any disc.
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