One of the most important skills you can develop as a photographer is the ability to shoot images that are crisp, sharp and in focus. That’s because, not matter how wonderful the photo is, if it’s out of focus, it’s ruined. And nothing can change that.
So, with that in mind, here’s an article with some great tips for avoiding blurriness in your photos:
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We've seen how managing the ISO setting allows you to control the amount of grain that shows in your photos. But it does more than that. Understanding and working with the ISO setting gives us added flexibility in terms of setting the other two exposure settings–aperture and shutter speed.
The bottom line is that ISO is an important and useful tool, and one that you will want to be comfortable with if you are looking to take creative control of your exposure.