WHAT IS ISO INVARIANCE & WHEN SHOULD YOU USE IT?
ISO Invariance is an important topic to know about, yet very people have even heard of it!
There are a lot of misguiding generalizations out there and the way that your digital camera performs at different ISO settings has implications to consider when taking images in low light scenes.
When photographing in low light (astrophotography for example) it is a delicate balancing act of several different factors to be able to achieve a high-quality image. It is important to know that you are making trade-offs, likely without realizing it, when selecting specific settings and affecting the final image.
Knowing about ISO invariance and variance, and how your own model of camera performs, will allow you to understand how to get the best image quality and manage digital noise in low light conditions.
Spoiler alert – surprisingly, on a lot of ISO variant cameras the digital noise actually reduces when increasing ISO in low light situations!
