Iso is light the more light the more crap and noise that can get into your photo.
Generally speaking, the more light that is captured during exposure, the cleaner the image will be.
ISO is the relationship between the intensity of light falling on the scene and how bright the final image is. ISO controls two functions:
- Metering. The camera measures the amount of light reflected by the scene towards the camera, and ISO determines the shutter speed and aperture combinations that the camera can use. High ISO values will expose the sensor less than low ISO values.
- Processing. The lightness of the final image is adjusted to give you consistent lightness with whatever ISO you use. High ISO values will lighten an image more than low ISO values, so that you'll end up with the same lightness.
If more light is recorded by the camera, then you'd typically have a better signal-to-noise ratio (a cleaner image), but in dim lighting you might not be able to hand-hold the camera without camera shake, and so high ISO will let you use a faster shutter speed, and the image will be suitably brightened more.
aperutre is field of view so smaller # the smaller the view which is for small object or 1 subject. this creates a bluey back ground. Higher the number the bigger the depth of view. so if you have a group of people you would make the aperture larger to keeps everyone in focus
Field of view is the width of the scene captured by the camera at the focus distance, and is more closely related to angle of view, which is determined by the focal length, sensor size, and the geometric projection of the lens. So the aperture has no effect on the field of view.
The aperture is instead the "optical hole" of the lens when you view it from the front of the lens. It may be wide or it may be narrow, and it is often adjustable in width via an iris mechanism.
Instead of using a physical measurement, like 25 millimeters for the width, photographers have devised a dimensionless ratio, called the f/stop, which is the focal length of a lens divided by the aperture width. This f/stop is hugely important as light meters don't need to know anything at all about the focal length of a lens or its aperture width: a given f/stop value will expose the image equally as well on any lens and camera.
The aperture width is very useful in directly estimating how much background blur, or how deep of depth of field you'll get from a lens. Basically, the bigger the aperture width, the more blur, and consequently, the narrower the width, the less blur (up to a point, thanks to diffraction).
It should be obvious that a wide aperture width will let through more light than a narrow one, and as the f/stop is the inverse of aperture width, smaller f/stop values will let through more light than large f/stop values.
shutter speed is the less the number the more flowing of the pic. like water falls think car lights at night. makes it a ling and silky.. higher the number the more detailed back ground.
Some cameras literally have a shutter mechanism—a physical screen that completely blocks the light from the sensor—while newer cameras have electronic equivalents. The "shutter speed" is the duration of how long the shutter is open: 1/1000th of a second, 1/100th second, 1/10th of a second, 1 second, 10 seconds, whatever.
If the shutter is open for a long time, it makes sense that moving objects in the scene will be blurred, and likewise, a tiny fraction of a second shutter duration will be able to freeze quick motion.
But fast shutter speeds limit the amount of light that is actually detected.
