Best For Details...
Welcome Friend,

Film .....
Camera .....
- ISO In very basic terms, ISO is simply a camera setting that will brighten or darken a photo. As you increase your ISO number, your photos will grow progressively brighter. For that reason, ISO can help you capture images in darker environments, or be more flexible about your aperture and shutter speed settings. you should always try to stick to the base ISO to get the highest image quality. means Minimizing Noise and Maximizing Image Quality. the image at ISO 3200 has much more noise than the one at ISO 200 (which I brightened with a long shutter speed instead). This is why you should avoid high ISOs whenever possible, unless conditions require you to use them. "A photo taken at too high of an ISO will show a lot of grain, also known as noise, and might not be usable. So, brightening a photo via ISO is always a trade-off. You should only raise your ISO when you are unable to brighten the photo via shutter speed or aperture instead (for example, if using a longer shutter speed would cause your subject to be blurry)."

- Low ISO you should always try to stick to the lowest ISO (base ISO) of your camera, which is typically ISO 100 or 200, whenever you can. If there is plenty of light, you are free to use a low ISO and minimize the appearance of noise as much as possible. Need to take care for some time Low ISO picks a blurry photo.
Ref -

High ISO
- High ISO is useful especially when working in low-light conditions. High ISO 800, 1600, or 3200. The High ISO has much more noise, i.e. more level of noise (graininess and blotchy colors). For certain types of sports and action photography, a high ISO might be your only option. to pick a sharp photo at a high ISO.
Ref -