الضوء والأحوال الجوية .. مجلة فن التصوير اللبنانية _ ع١٥

light and weather conditions

Many photographers resort to i'tikaaf in their homes and put their cameras aside, when the sun stops shining, or with a decrease in the percentage of natural light, bearing in mind that photography must be continuous in different weather conditions. Because of the possibility of obtaining interesting and distinctive shots.

Distinctive pictures at different levels of illumination. . .

The weather and weather conditions are subject to change from time to time all over the world. This change - and contrary to what many people think - is a blessing for the photographer, not a curse. This allows him to be creative in various types of photographic outputs, whether in terms of light or colors, which cannot be separated. But the photographer in this field must have complete knowledge of the method of photographing in various weather conditions, especially the cases that were often considered as obstacles in the face of photographic work, as they result in multiple technical dilemmas.

Traditionally, it is known that bright days, when the sun is shining and the dazzling light, is the most suitable time for photography, and the presence of the sun vertically above the head of the photographer and the subject is the most appropriate time for a clear and sound image, but now, with the presence of cameras, films, and other more advanced supplies, the light conditions are different. suitable for photography.

the clouds :

With the beginning of the appearance of clouds in the sky in a light form and the continued penetration of the sun’s rays, as we do not see a big difference in the percentage of light in this case, the percentage of light emitted to the earth through the sun’s rays is equal in a random way, as the clouds here work to scatter and disperse the light, which reduces its occurrence, With its distribution over places that were covered with shadows in a previous case, it is desirable here to take pictures with shaded details... Likewise, in this same case - the presence of scattered clouds in the sky - it is possible to obtain distinct pictures of people, even when the sun is hidden behind one of the clouds, here it is The effects on the quality of light are much greater.

Draw:

As for when the sun passes behind a cloud, the overall color temperature rises dramatically, and the color temperature is usually 5500 (K), but when the amount of blue light in the atmosphere .. and the sun disappears in the shade of one of the clouds, the color temperature becomes greater than 6500 (K). , means a high proportion of blue and if this is not properly compensated for. By the photographer, the colored images in this case will have the blue color in it the predominant percentage over the rest of the colors, and the image may be imprinted with a strong tinge of blue, and because it is very difficult to wait for the pale to recede for photography, a filter must be used to correct the color.
The hydroelectric filter - yellow on red - is of the 81 (0-81) or 81 (C) series. It is the most effective candidate, and it is not possible to generalize here because the color temperature cannot be limited to a type of clouds or clouds, and there is no measure to know the extent of the predominance of the blue color, especially since the naked eye cannot determine that, and it may happen, for example, that the sun disappears in the shadow of a certain building, or A large tree, which leads to a greater rise in color temperature.
Here, the matter calls for a stronger filter - a mixture of 81 (8) with 81 (B) the strongest - but in most cases it is sufficient to adopt one filter either with the clouds moving quickly to cover the sun and then recede from it, as the atmosphere becomes a mixture of shade and brightness. From taking an average reading of the light expression and then making a number of light exposures. When the sky is clear blue in some locations, and cloudy in others, here its photographic effect can be increased with the use of a polarizing filter, which works to increase the color contrast between the sky and clouds on the film. Colored, but with black and white film, yellow or orange filters can be used to obtain similar results.
Gradual filters can also be used for gray, as these filters give the cloudy sky a clear color to a dramatic extent.

the rain

The light conditions during rain are often similar to the conditions of very dark weather due to the abundance of clouds, where preference is given to photographing close subjects while avoiding including the sky within the image, as here we have to reduce the exposure by half a stop, to obtain richer color prominence.

The light in such a case is more blue than we think, and the matter requires the use of a high-speed film - 400 aza, while working at a high shutter speed with narrow apertures, and here a tripod becomes necessary, to maintain a reasonable depth of field

Lightning:

Lightning is a worthy subject for photography from a safe distance. The tripod is key here as we can take pictures of multiple lightning flashes using the time exposure " while the camera is on its mount, towards a storm, here we put the shutter speed at (B) with 100 aza film and we need a 20 second exposure Approximately at f / 16. A pickup wire must be used to spare the camera any vibration, and with some luck, several flashes can be recorded on the film during that period while the shutter is open at (B) as we mentioned.

wind:

The wind usually comes with light conditions, which necessitate slow shutter speeds, and here despite the presence of a heavy and strong tripod that is sometimes attached to our body.
Despite all this, we face difficulty in obtaining very clear photographs, due to the strength of the winds, and there is no solution here but to wait for the lighter winds, with the adoption of what we mentioned about the strong substrate. Rainy days also require color correction when we work on color photography, but he warns here against exaggeration that may Dampen the desired impression of the color image. Although an image with appropriate color balance theoretically requires the use of a correction filter of 81 (C) when the sky is very dark, a less complete correction will give satisfactory colors in general. It also maintains at the same time the suggestion of prevailing blackout conditions.

Strengthening, durability and stability - and slow shutter speeds can help in showing the effects of the wind on the site such as branches and leaves, but here it is necessary to emphasize the appearance of sharp non-moving targets. And with proper focus, such as the huge trunks of trees, in a landscape where the focus is on the movement of small branches.

the snow :

With a dark sky, we find that freshly fallen snow produces very light lights without shadows, and this gives us calm and static landscapes.
Exposures in snowy conditions are measured by readings taken up close, or by emergency readings taken with an isolated photoexpression device, and a comprehensive exposure reading for the entire scene usually causes incomplete results in front of the device being deceived in a wide area of ​​white snow.
We often imagine that the snow-covered fields are glamorous and have nothing to do with the blackness of the clouds above them. This is not true, but such an artificial effect can be created by means of a gray gradient filter, and the color contrast in snow-covered landscapes can be exceptionally low when the ground acts as a reflector to fill Shadows from below. As for the low humidity after snowfall, it usually results in clear vision, which means that the light spreads with snow and clouds from multiple directions, allowing the details of the subject to be clearly visible.
However, it happens that snow scenes often appear very blue on color films, especially if it is not
The subject is illuminated by direct sunlight.
And with photographing people, here you must also use the correction filter of the 81 series.

the fog :

It is the most emotional topic. It must be handled with care. Although the fog descends the overall level of illumination. However, the change that occurs in the quality of light is the most prominent thing here, as the colors become unsaturated, light and light. When shooting with a black and white film, it is necessary to overlook the attempt to preserve the color contrast by reducing the exposure and exaggerating the endorsement of the film, as long as this matter will eliminate The impression the image makes. Here it is necessary to rely on a fast film for more flexibility, and the coarse drip effects can add more privacy to fog scenes.

With color film, exposure is based on a reading taken from the most educated part of the scene. As for movies and slides, the reading is taken from a medium gray color gradient, so that the haze returns to the production of light.

It must be mentioned in this regard that the readings of the light expression first close to the subject, and then backing down to take the picture, must result in a fallacy in the exposure. The reason for that is that the fog eliminates that percentage of light that is between the camera and the subject, and this matter will be It is more important when photographing distant scenes, so the safety side should be adhered to, by limiting the exposure.