Tuesday, October 30, 2007
Depth of Field
I understand this is repetitive and some of you have answered these questions, but along with shutter speed, Depth of Field is the other very important topic.
Watch the video and then discuss the following.
How does lens selection (or Zoom on a zoom lens) affect depth of field? How does the aperture affect depth of field?
Why might you want to blur the background? What compositional rule can you think of that you suggest we blur the background?
For portraits are you more likely to want a blurred or sharply focused background? Does this require a large Depth of Field or a short depth of Field?
Describe how focus should be in a landscape photograph.
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I sent this video the farther that you zoom in the more blurred or sharper the image can become
to blur the background you can bring the lookers focus or attention too the focused image or the subject of the image. Focus extending right from the foreground through the background for landscape images.
The zoom gives the effect that the person is looking right at the camera and blurring the background but keeping the person/object in focus.
When you blur the background it lets the still be there but its not distracting the object in the picture.
For portraits you want to blur the background so the eye isn't distracted from the person in the picture
Zoom basically changes proximity and proximity changes the location of the depth of field. The aperture changes the size of the depth of field. Blurring the background can get rid of distracting objects and it can make sure you show the subject of the photo. You would usually like to have a blurred background for a portrait and this requires a short depth of Field.
-professionaly a 200f lens there's less depth of field
-to give your attention to the person rather than the background.
-focus silightly long dof
-focus would be a high and it would require a long Dof
In respect to which lens you use, using a longer lense (300 vs 35 mm) gives you a shallower depth of field. The longer your focal length, the more blurred the background will be.
Adjusting DOF with aperture is almost as easy: the smaller the f.number (2.8 vs 22), the shallower the depth of field. So the more you stop down, the more the background will be blurred.
When taking a portrait, it is helpful to blur the background to draw attention to the person, especially when there is a very busy background. When aiming for simplicity in your shot, a blurred background can be very helpful.
When you do want to blur your background, you will want to stop down to a lower f.number to give you a shallower depth of field. Inversely, when you want to take a landscape shot, where everything from the very foreground to the background needs to be in focus, a larger f.number will put more of your image into focus.
Zoom affects the depth of field by allowing you to zoom in to have less background to distract from the subject. Aperture affects the object, letting it stay in focus without too much background interfering.
You might want to blur the background if it is too distracting from the subject. Zoom out or lower aperture setting, to help blur background.
For portraits you are more likely to blur a background, because you don't want the viewer to be too distracted from the subject. This requires a short depth of field.
In landscape, depending on what natural obscurities there are, you will want to find an object either near or far from the lens so that it is the subject of the photograph.
The farther the lens is out the more the focus on the subject the more the blur is in the background. Sharpens the images pictures. Description of landscape images: the landscape isn't blurred and has a focus on the surroundings of the landscape.
-the zoom gives the effect that the person is looking right at the camera and blurring the background but keeping the person/object in focus
-when you blur the background it lets the still be there but its not distracting the object in the picture
-for portraits you want to blur the background so the eye isnt distracted from the person in the picture
When there is a longer lens, you are zoomed in more and there is less depth of field. When there is a higher aperture ( a smaller hole, and a higher number) there is a greater depth of field. So if you have a 200 mm lens and an aperture of f22, it will have greater depth of field than that of a 200 mm lens with a aperture of 2.8.
You may want to blur the background when you are taking a photo of a person, in a rather busy background. Blurry the background will take away the confusion of the photo, and bring the viewers eye to the subject. A composition rule that would benefit from less depth of field is contrast. If you have a bright subject against a white background but the background is a little crowded, blurring of the background may help to attract attention to the subject.
You are more likely to want a blurred background for a portrait, so the subject is focused on. This is done so using a short depth of field.
Focus in a landscape photo should be sharp throughout the entire photograph, so the eye is drawn through the whole photograph. This is done by using a great depth of field.
Lenses with higher numbers, such as 300mm, will have a 'thinner' DOF than 35mm. The background will become blurred more when the shutter is open longer.
A larger aperture size captures more on film, and can sometimes capture distracting elements. Using a smaller aperture allows for distracting elements such as background to be blurred.
Simplicity is one of the main reasons why you would want to blur a background. My blurring the background, the audience is shown where their attention should be within a frame.
For portraits, focusing on a person's eyes and face, while blurring the background is a more desirable effect. Leave out the distractions, focus on the person if the background is too 'busy' and doesn't add tot he frame.
By zooming you can focus on just one thing instead of bluring the entire subject. An example is if there is a distraction you could blur it out by focusing on the main subject.If the aperture number is bigger the hole will be smaller letting less in.
You might want to blur the background because of a distraction and you want to focus. Contrast because the subject can be one color and the background can be another.
For portraits you would like to blur the background so you are more focused on subject then the background. You can use a short depth of field for this.
For a landscape picture it would be best if the whole picture was clear to get the best of the picture.
this is me typing with my mittens :D
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