cp-16 question!

[mentos]

When using a light meter, lets say you test it and its 2.5.

Is there a ring on the camera that you are supposed to turn to 2.5 so that it matches the reading of the light meter?

If so, what is that ring called and why is it used?

thanks!

[Jon Taylor]

The principles of exposure in cinematography and stills photography are the same. Your lightmeter has a scale reading : f1.0, 1.4. 2.0, 2.8, 4.0, 5.6, 8.0, 11, 16, 22.

If your meter gives you a reading of between f2.0 and 2.8, decide whether this is 2 1/3, 2 1/2 or 2, 2/3 at 24 or 25 frames per second.

On the base of the camera lens there is an aperture ring which controls the iris. This determines the amount of light hitting the film in the camera gate (the higher the f-stop number the less light) The difference between say, f2.0 and 2.8, is f2.0 is double the amount of light as 2.8.

On the aperture ring there is a scale which corresponds to the scale readings on light meter, but these are calibrated as T-stops.

Set the aperture ring to the T-stop as given by the meter, and the film will receive the correct amount of light. Simple really.

Jon.

[eddie]

Thats a great straightforward answer.
Thanks Jon.