How To Build Concrete Bathtubs

Photo Features

The most accepted definition photography approach is the assertion that the size of the image of the subject should be, at most, 10 times smaller than the subject itself. That is, a photograph taken with a wide angle that allows a minimum focusing distance of 40 cm. not be classified as close-up photography and, instead, taken with a 180 mm macro lens at a focal distance of 1 m. yes it would. Therefore, the focus distance is not a defining feature of photography. But ...., in fact, the vast majority of the photographs classified as approach is taken with a very small focal length.
This actually triggered some features that are present in a large number of cases and what happened to list:

a) Approach
When the focus distance is small, the depth of focus is great. This means it is difficult to focus. Therefore, usually we can not use our camera autofocus and manual focus we do. In fact, in the limits of photomacrographs-size image of the subject similar to that of the subject itself, not even this will in many cases, be necessary to move the camera as a whole. A professional level camera is mounted on a rail.

b) Depth of Field
When the focus distance is small, the depth of field is also very small. In the limit of photomacrographs mm. So we shut everything we can to get the diaphragm to increase the depth of field. We must also align the plane of the lens to the maximum with the main plane the subject.

c) Shutter speed
If we close a lot of the diaphragm, enters low light. So shutter speeds are great. This has two important consequences:
c.1) We use a tripod and remote trigger.
c.2) If we do outdoor photography, we have a problem. Any little breeze to move the subject out of focus the picture. So it is hard ta take pictures of flowers, plants or insects on the outside. These wonderful macro pictures we see in magazines, of course, are under study. At least the vast majority.

d) Diffraction diaphgram
When we close we must be careful not cross a red line. From a certain value of f is the phenomenon of diffraction. A practical result-and inconvenient-is that the sharpness of the picture suffers. (More on this in another article.)

When the focus distance is small, the image is formed farther from the goal than you would for a greater focus distance. But the sensor is located far inside the camera body and we can not get more back, is it? . Of In fact, most articles on the topic describe an extensive set of gadgets, used for this very purpose: the separation between the sensor's goal as possible.
These are in a very brief summary of the main features of the photographic techniques employed in the field of photography and photomacrographs approach.