While I doubt any of us will use this WEB site while out in the field it appears to be useful for acquiring a sense of focus range

Aperture is the opening of the lens. The larger the opening, the more light comes in. But it also affects how clearly we see certain things.

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Depthof fieldphotography

The depth of field typically changes gradually. It typically does not occur where the subject is in focus, and suddenly — BAM! — something is out of focus. No. It’s gradual.

Shallow depthof field

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A shallow depth of field means that many elements in a photo may be out of focus. The photo below has a shallow depth of field because only the area around her eyes are reasonably in focus.

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Depthof fieldphotography examples

Those are very educational, thanks for the DOF Master site. That sort of instant feedback is good for learning for sure.

Each lens has a focal length written on it. You may have seen a lens of 15mm, which is a very short focal length. Or you might have seen that a lens is 300mm, which is a very long focal length.

Or sometimes, you might see a lens that has two numbers, such as 28-300mm. This means that the lens does not have a fixed focal length. You can change it by zooming in or out.

All I’ve done here is use the zoom feature. The f-stop and location of the camera are the same. I’ve simply zoomed in to the tea cups, keeping the focus point the same.

Shallow depthof fieldphotography

The below photo has a medium aperture of f/8. This is a common aperture for photographing things like street photography or landscapes where you want a lot of the scene that is farther away from you in focus.

A long focal length ( like 30mm) will result in a shallower (narrower) depth of field. Here, less of the tea cups are in focus.

Here’s what’s fascinating. You know this intuitively already. When you squint your eyes, you’re making the “aperture” of your pupil smaller. Less light is entering your pupil, but the way it enters the pupil and focuses in your eye creates a slightly clearer image.

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Depthof fieldexamples

The further away you are from things, the broader the depth of field. You know this intuitively because if you are standing with things far away, everything appears sharp and in focus.

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We’ll have another look at this photo, where I am very close to the subject. Again, the eyes are in focus, but things closer or farther are not in focus.

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In this photo of Joshua Tree National Park at night, everything is reasonably far away, and therefore all is sharp and in focus.

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Depth of field, sometimes written as DoF, is the amount of distance that is reasonably in focus. It’s the range of area that is acceptably sharp in a photo.

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Depthof fieldphotography formula

We’re going to discuss depth of field. But I’m going to try and keep it really simple. When I’ve given workshops and busted out charts, most people’s eyes glazed over. So … no charts. Just photos.

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I hope this helps. We’ve discussed several different ways to change the depth of field. This can greatly improve your images. If you have any questions, please share below!

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A deep depth of field means that there’s lots of elements in focus. For example, a photo of a landscape that is reasonably far away typically has everything in focus, such as the photo below. After all, if we look at a landscape, typically most of it does look in focus to us, doesn’t it?

I’ll show you some photos. While viewing these, remember that a higher number like f/22 means that the aperture is smaller, while a smaller number, like f/2.8, means that the aperture is larger. That was confusing to me when I first began, but you get used to it. Let’s have a look at three photos.

Up to now, I’ve mentioned how to achieve these different looks by discussing aperture, focal length and distance from the subject. Now, let’s look at this another way. Let’s look at this by what appearance you wish to achieve.

Depthof fieldphotography aperture

Plastic lenses are generally made from a strong material called CR-39, but also are available in a range of hi-index lenses, which are thinner and lighter.

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Thank you for the guidance. There is a WEB site at which you can input the lens Focal Length, the f-stop, and distance to a particular object that you want to be in focus. The calculator then provides the near and far distances for which the scene is sharp:

Depthof fieldphotography settings

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The below photo has a large aperture of f/2.8. It’s letting a lot of light in. See how the depth of field is shallower and only a small amount is in focus?

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Another way to control depth of field is by changing the focal length. If you have a zoom lens, you can change the focal length by simply zooming in or out, bringing the subject closer or farther. If you have prime lenses where the focal length is fixed, then you can change the focal length by changing your lens.

A short focal length ( like 15mm) will result in a deeper (wider, broader) depth of field. Here, more of the tea cups are in focus.

A creative question. Excellent. By controlling the depth of field, we can focus the viewer’s attention on a specific subject or place. This is powerful, and it’s a lot of fun! This makes controlling depth of field one of the most creative decisions that we can make.

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