![]() The funny thing about ISO is that it is an acronym, but nobody really knows what it stands for. The next question that most people ask is, how slow of a shutter speed can you use and still get a sharp picture? My blog post on Minimum Shutter Speeds will answer your question! At this speed, my hand is still moving, but the camera takes the picture so fast that my hand travels only such a small distance that it is not noticeable in the picture. To get rid of the blur, you need to increase the shutter speed to around 1/320th of a second. If you take a picture of me with a shutter speed of 1/30th of a second, then my hand will have moved in the time that the camera is recording the picture. Imagine me sitting here at my computer desk waving to you (you don't have to imagine very hard if you just look at the picture on the right). If you think about it, it makes sense that the shutter speed controls how much blur is in the picture. The shutter speed is also principally responsible for controlling the amount of blur in a picture. Just as the aperture affects the exposure as well as the depth-of field, the shutter affects more than just the exposure. That's me! Typing away on this article from my studio in Meridian, Idaho. Take a minute and make sure you understand this info before moving on. If you, like me, are more of a visual learner, then I think this graphic will help solidify the information about aperture. If you want to take a picture of a sweeping mountain vista, you'd want to use a small aperture size (high f-stop number) so that the entire scene is in sharp focus. If you want to take a picture of a person with a blurry background, you'd use shallow depth of field. Depth-of-field is how much of the picture is sharp, and how much is blurry. The aperture also controls the depth-of-field. The size of the aperture controls more than the brightness or darkness of the picture, though. If you take a picture and it's too dark at f/5.6, would you choose a lower f-stop number or a higher one? Yep! You'd choose a lower f-stop number, which opens up the aperture to let in more light. Let's test your knowledge to make sure you have it down. A high f-stop like f-22 means that the aperture hole is quite small, and a low f-stop like f/3.5 means that the aperture is wide open. Simple! Aperture sizes are measured by f-stops. How do you fix it? Simply choose a smaller aperture. ![]() So suppose you take a picture that is too bright. Obviously, if you shoot with the aperture wide open, then more light is allowed into the camera than if the aperture is closed down to only allow a tiny hole of light to enter the camera. The blades create a octagonal shape that can be widened (we photogs call it shooting “wide open”), or closed down to a small hole. The aperture is a small set of blades in the lens that controls how much light will enter the camera. ![]()
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