Location photography calls for much more portable materials and a large range of lightweight, folding reflectors are commercially available in a variety of colors. Larger-scale subjects such as motor vehicles require the use of huge "flats", often requiring specialised motorized winches to position them accurately. In tabletop still life photography, small mirrors and card stock are used extensively, both to reduce lighting contrast and create highlights on reflective subjects such as glassware and jewelry. Reflectors vary enormously in size, colour, reflectivity and portability. Techniques with board reflectors Ī portable folding reflector positioned to "bounce" sunlight onto a model The lamp faces away from the scene to be photographed, allowing only reflected light to be thrown forward. A very common example of this technique is the traditional umbrella reflector, invented by George Larson, typically having a gold, silver or matte white interior onto which a lamp fitted with a circular reflector is projected, providing a broad, soft illumination. By positioning a board reflector close to a light source, its effective size can be increased by "bouncing" the light off it. Reflectors may also be used as a means of increasing the size of the main light source, which may (or may not) retain a direct path to the scene. In this case, light "spilling" from the main ambient or key light illuminating a scene is reflected back into the scene with a varying degrees of precision and intensity, according to the chosen reflective surface and its position relative to the scene. As a result, it is most commonly used to control contrast in both artificial and natural lighting, in place of a fill light or "kick" light. This kind of reflector generally has a very low reflectivity factor that varies widely according to surface texture and colour. Board reflectors Īlso known as plane reflectors, "flats" or bounce boards, this kind of reflector is located independent of a light source the light is reflected off its surface, either to achieve a broader light source, or control shadows and highlights, or both. A matte reflector will typically have a reflector factor of around 2, due to its more diffuse effect, while a polished or metallic-finished reflector may have a factor of up to 6. The reflector factor is the ratio of the illumination provided by a lamp fitted within a reflector to the illumination provided without any reflector fitted. parabolic, providing a tighter, parallel beam of light.spherical, short-sided, giving a relatively broad spread of light.Although there are a large number of variants, the most common types are: Those ‘reflected’ lines extend back away from the surface, creating a ‘family of angles’ – effectively, a combination of the angles of incidence and the angles of reflection.Similar to a domestic lampshade, these reflectors are fixed to an artificial light source (for example, a filament bulb or flash tube) to direct and shape the otherwise scattered light, reflecting it off their concave inner surfaces and directing it towards the scene to be photographed. These lines strike the surface at a certain angle of incidence, relative to the normal (dotted lines), and bounce back off it at an equal angle of reflection. In the illustration below, the angle of view is delineated by two black lines extending from the camera to the subject. The angle of view is dictated by the size of your camera’s sensor, as well as by focal length, which is itself dictated by your choice of lens. ![]() Put simply, just as we can only see what’s in front of us with our eyes, we can only see so much through our camera. ![]() Your camera’s angle of view is finite because it has vertical and horizontal outer extents. The simplest way to think about them is to begin with the angle of view of your camera (also known as the field of view, or more simply, the camera angle). In photography, the family of angles is another useful means of working out where to position your light for a given shot.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |