Photography - ISO : Aperture : Exposure

ISO - The sensivity of the digital camera's image sensor to the presence of light

High ISO - dark atmosphere

Low ISO - bright atmosphere


Aperture - The size of the lens opening when you snap the photo


Exposure ( Shutter speed) - Total amount of light received by the film or sensor of a camera when the shutter opens. This result bright or dark photos.





Exposure modes in DSLR Cameras & Compact System Cameras


P - Program
A (Av) - Aperture Priority
S (Tv) - Shutter Priority
M - Manual


Shooting situations when it's best use aperture priority mode
> Landscape: maximise depth of field
> Portraits : background out of focus
> Macro photography
> Optimal sharpness from your lens

Shooting situations when it's best use shutter priority mode
> Sports & wildlife : freezing action
> Moving subject : emphasise motion
> Zoom bursts
> Landscape : blurring water

Shooting situations when it's best use manual mode
> Studio-flash photography
> Night photography
> Bulb exposure
> Exposure bracketing