The film market has the ability to customize a different light, in appropriate applications. The different sensitivity. So when we put our film, we have to adjust the sensitivity of the camera to match the sensitivity of the film. If set to false. The camera is metering. The film market has sensitivity below 50, 100, 200, 400, 800 .... Film, we shoot a general sensitivity to 100 or ISO100, we must adjust the ISO of the camera is 100 by the button. with the shutter speed. I have to pull the button up one stroke, then rotate it as required. But if we do not pull up the button, then it will become to change the shutter speed dial.
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