Let’s talk more about ISO.
What is ISO? ISO is the sensitivity of the image sensor to light. Remember the example of the worker bees bringing back the light for you. So if your ISO is set at 100 you are sending out 100 bees to bring back light. If it is set at 1600 then you are sending out 1600 bees which will get you a lot more light then the 100.
When people talk about ISO they talk about the noise or grain you may see when you bump it up. If your photo is exposed properly it cuts down the noise but we will talk more about that later. Today, I wanted to show you an example of the grain/noise that you may see as your ISO increases. Sometimes I like to embrace the grain and if you convert the picture to a black and white it can look really cool.
It is always nice to enlarge your picture to 1:1 ratio or 100% view if you are going to print it. This will help show you if your picture has a lot of noise that may not be noticeable when viewing on your computer at a smaller size.
There are different types of noise reduction software out there. I just recently learned how to use that setting in Lightroom and I love it.
All of these shots are SOOC for the purpose of you seeing the noise.
Your camera will limit how high you can set your ISO. These were taken with my Nikon D90. Depending on the type of camera will depend what your noise looks like at different levels. My Nikon D700 can go much higher. Full frame cameras have more abilities than crop sensors. I challenge you to do this little experiment and see how high you can go.