Practice question · True or false
The ISO speed point for a black-and-white negative film is measured on the straight-line portion of the characteristic curve.
Hints
- Ask where a density of 0.10 above base plus fog falls.
- It is very near the bottom of the curve.
Show the answer
False
Why
False: it is on the toe, at a density of 0.10 above base plus fog. That is precisely why the speed rating is a statement about shadows: it marks the least exposure that produces any usable separation at all, which is why underexposure empties the shadows before it touches anything else.
Practise Film and the Characteristic Curve
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