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and Scanning (Panning)

Consider the bar as a photographic technique could be considered really over because it depends too heavily on luck. In essence, consists of photographing a moving subject so that obtained making it appear as sharp as possible while the background is blurred. To do this is to pull the trigger and hold it for a moment in which we simultaneously the camera follows the subject in its path. This depends on too psychomotor factors as to enable us to ensure the taking of a particular photograph in specific conditions. But there are things you can do:

a) If moving subjects, cyclists, cars, etc. We recommend using a telephoto lens.
first for safety. We must be as far away as possible from the moving subject.
Second, because it be further from monitoring the movement of the camera will be lower, which will enable us to obtain the image reasonably sharp.
b) must choose in advance a suitable background. A fund that is easily "focus", or whatever it is, as uniform as possible.
c) It is important to measurement of exposure in advance and work in manual mode. Here is one of the practical problems of this kind of photography. There are two contradictory needs.
one hand it is appropriate that we open the aperture as possible (small f number) to facilitate the task of blurring the background. We should note that this will blur overlapping two very different types. Optical blur produced in areas not covered in the range of depth of field and blur caused by camera shake.
On the other hand, we need a time of relatively slow shutter release so you can continue to record the scene with the shutter-release button for a while. Obviously
a wide open aperture usually requires a fast shutter speed. Similarly, for the second course, a slow shutter speed often requires a more closed aperture. Thus we get a balance, with light conditions as a judge making final.
d) Finally the most important piece, stolen in the first paragraph, which refers to how to focus. On this there are many alternatives. I personally recommend that requires using the AF-ON button. It basically consists of the following:
About the area on which is supposed to spend the subject autofocus is performed using the AF-ON button. If we keep pressing, but we move the camera pointed in other directions, it stays. The subject is approaching, put your finger on the trigger. When we consider that the frame is correct press the shutter. No autofocus attempt occurs. We continue with the camera at the subject while keeping a finger pressed the trigger and another AF-ON button. When we consider it appropriate to withdraw the finger from the trigger and voila: A great photo scanning achieved. Or not. Pictured
this article appears headed diecitantos attempt made to these assumptions in a bike race held Albacete mid-June. We used the fence surrounding the park as a suitable background.

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Depth of Field and Open Diaphragm

The variation of the depth of field with aperture is induced by the variation that occurs in the depth of focus. In the diagram annexed a situation can be observed for diaphragm open at the top. This causes the existence of a certain depth of focus formed by all image planes located immediately before and after the focal plane (sensor position) in which the cone angle for the solid image whose vertex is P 'detemine cuts smaller than the circle of confusion and therefore indistinguishable from a dimensionless point for the purpose of human vision.
If we proceed to close the diaphragm, as shown in the bottom, the angle is narrower and therefore the depth of focus increases. This is because the size of the circle of confusion is exactly the same on both occasions. Depth of Field
is linked to the depth of focus in the sense that the planes A 'and B' are respectively the image planes corresponding to planes A and B approach and if it widens the gap between A 'and B 'also widens the gap between A and B, ie the depth of field increases.
So you can set the following rule:
a) If the aperture opening decreases, increasing the depth of field.
b) If the aperture opening increases, decreases the depth of field.

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The picture I have obtained approximation is it? Depth of Field

When a photographer is about to experience in the field of photography Approach, a recurring question is whether a particular decision made meets the criteria that could qualify it this way or not.
already know that the main feature is that the reproduction ratio is greater than 10, or whatever it is, that the size of the image is at most a tenth of the real subject and so the situation, specifically called Macro Photography, in which the image size is similar or even slightly higher.
From a practical standpoint, the amateur photographer probably using an objective of the so-called Macro. On such objectives can lead to some confusion because, contrary to his own name, many of them can not get real macro photography, but merely close-ups. Another possible alternative approach would be to use lenses. The resulting quality is lower but the cost is significantly lower. The other gadgets are usually limited to professional use and therefore outside the scope of this article.
There are actually two different mechanisms for confidence that a particular photograph meets the requirements of the Stock Approach:
a) First, if we use a macro lens, it is possible that we have a focus limiter. This means you can only focus on a limited range of distances. Then we can focus at close range or from middle distance to infinity. If we focus at close range, the limiter is active and we know we are presumably in the scope of this type of photography.
But the key issue is to carefully read the lens manual. (Yes, the objectives have manuals and is very convenient read). To give a concrete example, the Tamron 90 f2.8 if the focus distance is less than 1 meter, you are guaranteed that the image obtained will be at most 10 times smaller than the actual subject. That is, we are squarely within the definition of photography.
b) Secondly, we use the criterion of the size of the frame. Let me explain: We know, for example, if your camera body using the APS-C format, this means that the sensor size is approximately 16x25 mm. In this case if the frame of the real world has a maximum size of 16x25 cm, the image obtained will be within the parameters of the photography.
A common situation in which this restriction is checked often, for example, when photographing a single flower.