Shoot scenery of depth of field prediction
We all know that a good scenery works, the key lies in light and shadow effects, and depth of field control, effectively control depth of field will contribute to the performance of the work topics.
To properly grasp the depth of field, depth of field is used to predict this function, when it comes to predicting the depth of field, we would first like to briefly look at what depth of field.When the lens at a photo taken in, and after being taken in some clear distance, this distance is called depth of field.
Depth of field is the with Aperture change, the greater the depth of field, the smaller the aperture, the smaller the depth of field, the larger the aperture. In addition, the depth of field also come with the camera and the distance between the camera body and lens focal length.The following figure, this picture is to use the EF100-400 telephoto lens, the body as much as possible to narrow the aperture priority mode, to stop all the way up to narrow depth of field, highlight the theme that blur the background.
We have to stop and an understanding of the relationship between depth of field, but how to know the range of depth of the current aperture? this prediction of the depth of field.
But since the viewfinder digital single lens reflex cameras, we use the structure of digital single lens reflex cameras, can't see the aperture of the depth of field. We all know that single lens reflex cameras through the lens of the camera is light, use five Prism reflect light, the image is projected onto the viewfinder. Photographer through the viewfinder is very easily absorbed object observed. The camera's autofocus system is through the lens into the light to achieve precise autofocus, into the light, the more convenient viewing observation and AF, viewfinder, SLR camera lens aperture is always open to maximum aperture, up to chase light status. For example, your lens aperture range F2.8-F32, even if you put the aperture set to F32, camera, lens aperture is at maximum F2.8, this could make the viewfinder for the brightest effect, convenient locations and focus. Thus you see in the viewfinder is the most shallow depth of field, although you can see the principal, but can't read it before, when you press the shutter, aperture diameter will shrink to the location you set the aperture, for instance, before and after as F32 depth of change is quite big, and we see in the viewfinder of the surrounding environment is clearly presented.Many beginners shooting in the viewfinder to see clearly the subject photographed, but couldn't see it before environment and scenery, film shoot out later found more out around the subject of many elements, sometimes even a picture of the effects that this will require the prior to the depth of field shots do a forecast.
First of all we have to look at what is photosensitive tolerance.
From the lightest to the darkest, assuming that the human eye can see the following range, the following chart, the camera can performance is far better than the eye can see range small, this limited scope is photosensitive tolerance.In my experience with digital cameras, although digital camera photographic tolerance than film cameras, digital cameras not only the auto white balance settings, but also according to the automatic metering system to automatically set the film speed, so the digital camera has a vast creative space, the following pictures to illustrate how to use the PC to be creative latitude.
In the above illustration, this beach Sunrise's film is at the seaside with a digital camera and a telephoto lens, when the Sun is rising out of the sea, making eye observation already can see everything on the beach and the passing of seabirds of color, then a sunrise on the beach gold, but the author of the idea was to shoot shooting Sunrise Sun, not the performance of the beach of texture and detail, author of the Sun with the telephoto, with spot
Around the Sun for metering, at which point the camera photographic tolerance will play a role, it can accurately metering point exposure, but the images of dark-dark, or even completely lost details formed a silhouette, so that was a perfect Sunrise photos and use AV priority mode automatically improves shutter speed, accurately capture the seagulls skimming the surface during the posture.PC with good tolerance to do the following.
Predict the performance of the tolerance range: through more shooting practice, experience and the human eye can see the actual shooting a efficiency gap.
This film, will be able to use tolerance characteristics, to consider the final shots.Calculation of light: light ratio of size determines the final manifestation of the effect, in the performance of tolerance that there had been some experience, you see the light in the scene shots than difference you probably know what will happen as a result of the shooting, to seize this opportunity to take to the wonderful moments!
Precise exposure: to emphasize tolerance characteristics, metering General to openly or covertly in one hand that extreme, choose the brightest or darkest parts to metering.
In this case, you need to precise exposure to get very good results, you can spot or reducing exposure compensation.
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