On location.
When on location using natural light, whose source is the sun. Sunlight is constantly changing depending on the altitude of the sun and atmospheric conditions. It is not constant in intensity and spectral distribution of radiation energy. In the early morning and late afternoon hours of natural light contains much more red and orange rays than in the middle of the day. This phenomenon also depends on time of year, weather conditions, and geographic latitude.
When the effect of horizontal light beam of the sun form long elongated shadows of objects.
During normal daylight solar radiation on horizontal and vertical surfaces is distributed evenly in the highlights and shadows of the spectral composition of light changes slightly. This is the best time for photography.
Hours close to noon, called the period of illumination zenith. This is a time of sharp contrasts-light horizontal and vertical surfaces. Vertical surfaces receive a half times less light than the horizontal, resulting in light and shade in this period, a sharp contrast, creates a very deep sculpting the form of individual objects that conceal the details and distort perspective. This watch is the least suitable for landscape photography.
In the twilight illuminated directional light is absent, the entire surface of the earth and the objects illuminated by diffuse light of the sky. When taking pictures in the dark can be obtained effect nighttime images.
For the photo shoot done on location is important to correctly assess the state of the atmosphere. On its optical properties are affected by weather and climate, which should be taken into account in photography. Such a light favorable to the shooting on color film, as in black and white in this case is difficult to convey the plastic object.