light meter: An electrical exposure meter for measuring light intensity.
Indirect-reading capacitor type pocket exposure meters and accessory electrometers???
Direct-reading electroscope type pocket exposure meters???
Mode dial: Selects the following modes: Self-time, multi exposure, auto bracketing, continuous shooting, Normal, exposure metering user setting (center-weighted average metering or spot metering), previewAE lock user setting, and ISO user setting.
You'd better consult the exposure meter if you are not sure of the time for exposure.
Let's have a look at the exposure meter.