On a low F number, you should notice the background is very blurred, when compared to the main object that is in focus. This is extreme to ensure you easily see the visual differences as you change the F number. Go outside and photograph a close object where the background elements are far away in distance.Expensive lenses can go as low as F1, where most on average will be able to shoot at around F4. It’s important to note that each lens will be able to shoot at different apertures. Change your camera’s aperture F stop to the lowest number possible for your lens.If you don’t see the letters AV or A, then refer to your camera manual. Nikon users need to change the dial to the letter A. For Canon users, this means turning your mode dial to AV. Set your digital SLR camera to aperture priority mode.Assignment: Lesson in aperture priority mode Then and only then, will you fully understand how to use it when shooting in manual ( M) mode. ![]() Learn how to use aperture priority and how different F numbers effect the overall image. Understanding how each mode works separately, is vitally important before trying M (manual mode). ![]() Photography Assignment – Grab your DSLR camera and give this a try Therefore its important to experiment with all your camera lenses so you know your equipment better.Īll photographs shown on this page are taken with a Canon 400D (Rebel XTi) Digital SLR Camera. For example just because an aperture value of f/5.6 for your macro lens results in a blurred background, it doesn’t mean you should also set your telephoto or wide angle lens to the same f stop. It’s also important to note that results from aperture settings can change from one lens to another. As you can see the foreground object is in sharp focus and the background is blurry. Now for the second photo, the aperture was set at a smaller number f/5.6 so only the rocks and sand at the foreground are in sharp focus while the background elements are blurred.Īnd here is an example of a close object photographed with an aperture value of f/5.6. In the first photograph shown below, the aperture (f number) was set at f/11 so all the image is in focus. Shown below is a couple of examples I’ve done myself to help explain aperture. More importantly, when you view them on your computer take notice of how much of the photo is in focus. One with as low a F number as possible and one with as high a F number as possible. The best way to understand how aperture works is to take numerous photographs with different f-number values and see what the difference is. Closing your lens more refers to a higher f number.Opening your lens more refers to lowering the f number.This often causes much confusion with beginners. Alternatively, if the aperture is a large number, say F22 then the lens diaphragm is smaller or more closed. So if someone says to you that you need to open your lens more, they mean to lower the aperture or F number. When the f number is small, the lens diaphragm is actually wide open. You may need to refer to your manual to find out how to change the F stop for your specific brand of camera. Once you have AV mode turned on, you can change the f-number by rotating the main dial above the shutter button. The letters AV (for Canon camera’s) or A (for Nikon camera’s) on your mode dial sets your digital SLR camera to aperture priority. Your camera then changes all other settings such as shutter speed automatically to suit. How to set your camera to aperture priority? The display shown on your LCD may look different to this example, depending on the make and model of your camera. You can see what aperture your digital SLR camera is set at by looking at the back LCD screen for a F number. As you can see by the image above right, the aperture in that example is set at F4.0. ![]() On the other hand if you’re taking a photograph of a bird and you want the animal in focus but not the background, then you would choose a small F number like F/4. For this to happen you will need to set your digital camera f value or aperture as its known, to a large number, for example F/11. For instance if you’re taking a photograph of a landscape, chances are you will want all of the foreground and background to be sharp and in focus. The higher the F number, the more of the photo that will be in focus. On digital SLR cameras, aperture is indicated by a f-number value. If you’re after more technical details, Wikipedia already has a great article on how aperture works in photography. For example photographers can choose to have a sharp foreground and background, or they can blur the background. For photographers who use SLR cameras, AV or A mode determines whether all the photograph is in focus or part of.
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