Cet appareil extrèmement rudimentaire est resté inchangé sur son principe depuis la préhistoire de la photographie. Cette boite magique ravit aussi bien les débutants que les photographes expérimentés en permettant la réalisation d'une image sans objectif entre le réel et la photographie.
La technique de construction est simple et tout à fait accessible à l'amateur. Notre but n'est pas de priver qui que ce soit du plaisir de monter son sténopé, mais de proposer un appareil élégant, construit avec précision, pratique, facile à utiliser et à controler.
Pas besoin d'investir dans un objectif, et le dépoli et dos arrière sont compris avec l'appareil. Le dos arrière est compatible avec les chassis 4x5 modernes (type Fidelity) ainsi que les dos Polaroid à insertion (type 545) et dos roll-films à insertion (Calumet, Linhof, Sinar).
Le trou est percé dans une plaque de métal très fine de façon à être parfaitement circulaire, et son diamètre (généralement 0.3mm) a été calculé de façon optimale par rapport à la distance du film, assurant une excellente qualité d'image pour les distances focales courantes (75 à 150mm).
Cette plaque est facile à changer en cas de besoin, et la monture peut permettre le montage de filtres de couleur. L'appareil peut être fixé sur trépied en vertical ou horizontal (fixation 1/4").
Nous vous laissons choisir la profondeur de l'appareil, et donc son angle de vue (à nous communiquer lors de la commande).
La valeur de diaphragme est déterminée avec précision, ce qui vous permet d'utiliser l'appareil dès le déballage. Et on peut le décorer !
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This extremely simply functioning ancient tool is used even in our days, likewise it was hundred years ago. Significant number of those who train themselves in photography make their first frames with a pinhole camera. This magic box is the most useful tool to get familiarized with the mysteries of photography. Many feel a need of such way of picture making even after many years of photographing, while even serious life works were produced by camera obscura. As simple is its operation and usage, as easy it is to construct, even at home. Our intention is not to deprive anybody of the experience of photographing with his own made pinhole camera, we only would like to help making photos with camera obscura more practical, versatile, and controllable. Furthermore our customer will have an aesthetic, precisely built box, which is specifically useful for such institutions or schools, which put an emphasis on photography education. You do not have to bother with investing into expensive lenses, there is no need of a groundglass, and a separate production of rear, because it is a part of the box. The rear of a 4x5” camera obscura is constructed to be compatible to today’s standard cut filmholders (Fideltiy, Lisco etc.), and roll and Polaroid filmholders for 4x5” format cameras. Customization is possible of course, when using for example a Rada filmholder. Furthermore camera obscura may be constructed smaller or bigger then the 4x5” format. Another important point of the camera is the pinhole, through which exposure is done. The pinhole is drilled in a very thin metal film, so that it will have an orderly formed circular shape, and its diameter will be optimal to the distance between the plane of the pinhole and the film plane, thus insuring the smallest circles of confusion, that is excellent picture quality. In case of damage of the pinhole film, it is easy to exchange. The mount holding the pinhole film is also for mounting color filters. The depth of the box, which sets the camera obscura’s angle of view, must be determined by the customer. The F stop of the camera is precisely countable, so our first frame can be exposed correctly
The tripod mounts (1/4 inch) on both sides of camera obscura make it possible to mount the camera on a tripod when taking a photograph either in horizontal or vertical format.
The diameter of the hole is generally 0.3 mm. According to my experience an opening of such a measure ensures excellent image quality in case of the most common focal distances (75-150 mm). As soon as the angle of view is decided, the f-stop of the pinholecamera is easy to calculate. Then the exposure time can be set accurately.