Question about Nikon COOLPIX P90 Digital Camera

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Why doesn't f2.8 show depth of field?

For Nikon P90, in Aperture pref mode, why doesn't f2.8 show depth of field? Shouldn't everything outside of focal point be a bit blurry?

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Yes. But the operative word is "bit." Because of the small sensor size of the P90, you have a short lens. Zoomed all the way out, it's 4.6mm. A 4.6mm lens is going to give you quite a bit of depth-of-field, no matter what aperture you use. Even zoomed in, it's 110.4mm.

Compact cameras simply can't give you narrow depth of field. Not without altering the laws of physics.

Posted on Dec 22, 2009

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Aperture function


The primary function of the aperture is to control the amount of light passing through the lens. The more light passes through the lens, the less time is required for the proper exposure. A faster exposure can freeze motion and alleviate camera motion, while a longer exposure can allow the subject to blur, conveying a sense of motion.

The aperture also affects the depth of field. A wider aperture narrows the depth of field, causing the foreground and background to blur, while a smaller aperture widens the depth of field, putting more of the scene into focus.

It's up to the photographer to decide which effects to show. Usually for a portrait you'd want the subject's face to be sharp and the background to be blurry. For a landscape, you'd generally want everything from the foreground to the background to be sharp.

May 22, 2012 | Canon PowerShot SX120 IS Digital Camera

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Controlling Depth of Field


A photographed object will only appear sharp in an area a specific distance from the camera. The human eye and brain still accept some areas of the image as acceptably sharp if they lie near the plane of focus and already show a small degree of blur. This zone, which is still in acceptably sharp focus, is called depth of field.

You'd typically want a wide depth of field when shooting landscapes, so as to have everything from the flower in the foreground to the mountains on the horizon in focus. You'd typically want a narrow depth of field for such subjects as portraits and flowers, blurring the background to avoid distractions.

How large this depth of field is depends on the distance to the subject, the aperture, and the focal length of the lens. Whether you're shooting film or digital makes no difference.

If the plane of focus lies further away from the camera, the depth of field is wider than if the camera focuses on an object close by.

Small apertures (large f/numbers) result in a wider depth of field.

Short focal length lenses (wide angle) have a wider depth of field than long focal length lenses (telephoto).

The depth of field is determined by the actual focal length of the lens, not the "35-mm equivalent" often used in the camera specifications. Because most compact cameras have sensors much smaller than SLRs, they have much shorter lenses, giving wider depth of field. This is great for landscapes, not so great for portraits.

To get a narrow depth of field, set the aperture as large as you can (smaller f/numbers), move in close to the subject, and zoom in. If your camera doesn't give you direct control over the aperture, try using the Portrait mode. And yes, the last two items above, moving in close and zooming in, are in opposition, You'll have to decide on the best balance for your picture.

To get a wide depth of field, set the aperture as small as you can (larger f/numbers), move away from the subject, and zoom out. If your camera doesn't give you direct control over the aperture, try using the Landscape mode.

Before going on vacation or shooting your child's wedding, experiment with these factors. Shoot things in your backyard or at a park, trying for both narrow and deep depth of field, then look at the pictures on your computer.

on Jun 23, 2011 | Cameras

1 Answer

How to isolate the background with finepix s2950


You're looking for what's called a narrow depth of field. The depth of field is controlled by three factors.
The shorter the focal length of the lens the wider the depth of field. To decrease the depth of field, zoom in to a longer focal length (to the telephoto end of the range).
The closer you are to the subject the narrower the depth of field. To decrease the narrow field, move closer to the subject. Also, separate the subject from the background as much as possible.
The wider the aperture the narrower the depth of field. Unfortunately the lens on your camera does not have a particularly wide aperture.
In addition to all that, the sensor on your camera is much smaller than the sensor on a dSLR or most film cameras. This means that the lens on your camera is much shorter than would be used on those larger cameras. From the first point above, a shorter lens gives a wider depth of field. The point is that a compact camera simply cannot narrow the depth of field nearly as much as a larger and more sophisticated camera.

May 01, 2012 | FUJIFILM FinePix S2950 / S2990 Digital...

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What shooting mode do i need to shoot a subject clear but the background blurred


If you're using the point&shoot modes, use the Portrait mode. For more control you're going to want the PSAM modes.

What you want is a narrow depth of field. Depth of field is controlled by three factors. The first is the lens aperture: the wider the aperture (smaller f/numbers) the narrower the DoF. The second is the lens focal length: the longer the lens the narrower the DoF. The third is the camera-to-subject distance: the nearer you are to the subject the narrower the DoF.

The easiest way to control the aperture is to use the A mode. This lets you set the aperture and the camera will automatically set the appropriate shutter speed to give the proper exposure.

You can zoom in farther and move in closer (yes, the two are in conflict, you'll have to determine the proper position and focal length for the picture you want).

Feb 14, 2011 | Nikon D40x Digital Camera

1 Answer

Im knew at this and i want to know how to take say like a picture of a flower and zoom in so it focuses on one part of it, and blurry in the back ground how do i do that with the nikon coolpix L110?


That's called depth of field and what you're looking for is a shallow depth of field. This is achieved by using a wide aperture (an F stop of 5.6 or lower). I'm not too familiar with the L110 but you may achieve this with the Scene Mode "close up" which is available on your camera.

Jan 21, 2011 | Nikon Coolpix L110 Digital Camera

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I got a Nikon D5000 and 18-55mm lens. When I take pictures using focal between 18-24 mm the deep of field is not sharp especially for landscape pictures. I made at list 200 pictures (the same image) test...


We need to understand Depth of Field first. Depth of field increase in two ways, one with the Aperture setting and one with the distance the lens is focused on. Example, at F22 focused at 10 feet the Depth of Field will be (assume for the example) from 7ft to 20 ft. You need to use the camera in aperture mode, set it to a "Slow" aperture, the larger the number the slower the aperture. Example F2.8 is "fast or Open, F22 is slow or "closed". The problem is not in your lens or camera. To get maximum Depth of fuield you need to shoot in Aperture Mode, set the f-stop to F11 or slower, F16, F22. The use manual focus to focus the lens. Using auto focus is "ok" for many scenes but to get MAX Depth of field you cannot let the camera select the object to focus on. Here is the BEST way to do it. Setup your camera in Aperture mode, set F-stops as suggested above. Focus on the subject that you want and shoot. Dont forget, the camera will be using slow shutter speeds like this so camera shake will create blurr that can be confused with out of focus. Shooting slow at F11 to F22 usually required a good tripod. Also, another thing to know, Field of focus is deeper "behind" the spot you are focusing on than in "Frint" of the point you are focused on. Good luck, Worm1855

Dec 28, 2010 | Nikon D5000 Digital Camera

1 Answer

How do you take a pic with the Nikon d60 where the background is blurred?


You're trying for what's called a narrow depth of field. DoF is controlled by three factors: distance from camera to subject, lens focal length, and lens aperture. The closer the camera is to the subject, the narrower the DoF. The longer the lens focal length, the narrower the DoF. The larger the lens aperture, the narrower the DoF.

Get as close to the subject as practical, and use as long a focal length as practical. I realize these two aims conflict with each other. For portraits, you want a focal length in the 50-90mm range and move in to fill the frame.

You want to shoot with as wide an aperture as you can. Unfortunately most lenses are not at their sharpest wide open. Also, the 18-55mm lens doesn't open up all that wide, f/3.5 at 18mm and f/5.6 at 55mm. To get the widest aperture, you can shoot in the P or A modes. If you don't want to leave the point&shoot modes, try using the Portrait mode.

Since you're not paying for film, I suggest you experiment with the different settings and shooting setups, moving closer and farther from the subject, using different focal lengths, and using different apertures, and see what results you get.

Nov 22, 2010 | Nikon D60 Digital Camera with 18-55mm lens

1 Answer

I want to take a picture that is focused on the subject, while everything else in the picture is blurry


What you want is a limited depth of field. There are three factors that control the depth of field: subject distance, lens focal length, and lens aperture. The greater the distance, the wider the DoF. The shorter the lens, the greater the DoF. The smaller the aperture, the greater the DoF.

One problem with compact cameras is that they have very small sensors. This means that they have short lenses. And short lenses mean they have wide depth of field. This is often an advantage, in that more of the scene is in focus. Unfortunately, this works against you when you don't want a wide DoF.

At the short end, the S2's lens focal length is 6mm. This will put just about everything in focus. Even at the other end, the focal length is 72mm. With a 35mm film camera, most portrait photographers use lenses at least 85mm in focal length in an attempt to minimize DoF to draw attention to the face and blur the background.

Unfortunately, the best you'll be able to do is to set the camera to the portrait mode, get as close to the subject as possible, and zoom in as much as possible. I realize the last two conflict with each other, you'll just have to find the proper balance for whatever you're photographing.

Nov 18, 2010 | Canon PowerShot S2 IS Digital Camera

1 Answer

What mode do i use to make a person clear and the background blurry?


It's not the mode, it's the aperture. What you want is called a "narrow depth of field". Depth of field is controlled by three factors: focusing distance, lens focal length, and lens aperture. For portrait work you probably want a focal length in the 50-100mm range and an aperture as large (smaller f/number) as you can get.

How you get the large aperture is up to you. Probably the easiest is to select Aperture-priority mode and crank it as far as it goes.

I encourage you to experiment with it. If you can't get another person to help you, just put an object where you'd prefer to have a head. Use different apertures, and different focal lengths (moving closer or farther to compensate). It's not as if you're paying money for film and processing, after all.

Apr 21, 2010 | Olympus EVOLT E-500 Digital Camera

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