When taking a photograph, sometimes it may be desirable to have the entire image sharp and at other times you may be interested in focusing only a small portion of the scene. You can easily achieve the desired effect by tuning the camera to aperture priority mode for either high depth of field or shallow DOF. A high depth of field is the scenario where everything in the plane of focus is in sharp focus.
The shallow depth of field on the other hand is the technique of focusing only a small portion of the plane of focus resulting in effectively focused subject amidst defocused background and foreground elements. The shallow depth of field helps in profoundly separating the subject by beautifully blurring the background clutter.
Bokeh is the aesthetic quality of blur in out of focus areas of the image. Bokeh is the terminology used for defining the quality of blur achieved at shallow depth of field. It refers to the quality of blurred imagery complemented by circular discs of light rendered by out-of-focus points of light. This is simply due to the actual optical design of this lens. This comparison between various Canon 50mm lenses show how the bokeh differs, with the more expensive glass performing better.
Using a shallow depth of field is possibly the easiest way to direct attention to your subject. Your subject pops out from the background, giving a near 3-D effect when used well.
And then we just need to take care of our lighting, our composition and the background, for more effective on-location portraits. The things we need to consider in our photography are nearly invariably inter-connected like that in some way. Since I desired a very shallow depth of field in such bright light, the wide aperture forced a high shutter speed. This would mean reduced output on my flash. And the easiest would be to use wireless radio controllers like the Radio Poppers. I had my assistant hold up a white reflector to throw some light directly onto our model.
Her face is now lit by sunlight, yet the rest of her body is still in shadow. Two different white balance settings would be needed.. But I like the effect here — it helps direct attention to her. A reflector is often used for just a bit of fill-light on the subject, but in this case the light from the reflector becomes a main source of light. It is one of the reasons I returned the lens when I bought it last year.
Depth of Field, Bokeh and Subject Isolation. In the world of photography, the amount of spatial distance that appears to be in focus to our eyes is called the depth of field. Depending on the genre and style of photography, a photographer may choose to have a deep depth of field majority of the scene is in focus or a shallow depth of field small portion of the scene is in focus. Shallow depths of field are useful for isolating subjects from their surroundings, while deep depths of field are useful for displaying as much of the scene as possible.
An important component relating to depth of field is bokeh, which is the visual quality of the out of focus areas of an image. High quality bokeh can be achieved by creating greater subject isolation, which is the degree to which the out of focus regions are maximized relative to the main subjects. To better explain the concept of subject isolation, position your finger a few inches away from your eyes and focus on the fingertip. Notice how narrow your visual depth of field is?
Now try focusing on something several metres away and take note of the greater depth of field that your vision has rendered.
This concept is exactly how camera lenses work; the closer the subject is to the camera either by physical distance or by using a lens with a longer focal length , the greater the subject isolation will be in relation to the background.
There are three factors which control the depth of field and the amount of subject isolation: aperture, camera-subject distance, and the focal length of the lens. The way that these three factors influence image composition and depth of field will be further explained in this article. The area that covers the focused area is the DOF depth of field.
Bokeh on the other hand, refers to the appearance of the light that is seen within the blurred part of the photograph. Bokeh and DOF are important to consider for photographs when you need the main subject to stand out on its own and not be lost in background distractions. Important steps to achieving blurred backgrounds with good bokeh in most circumstances, is to have:.
Anyone who has seen a Jade Vine, will know that the flowers are tightly packed together. I was fortunate enough to have found one that had fallen to the ground.
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