Стереофотоаппарат

Материал из свободной русской энциклопедии «Традиция»
(перенаправлено с «Стереофотоаппрат»)
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Не удалось преобразовать TeX в MML с помощью серверного MathJax: ошибка:
/var/www/wiki/w/extensions/MathJax/node_modules/esm/esm.js:1
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Icons-mini-icon 2main.png Основная статья: Стереоскопия
Icons-mini-icon 2main.png Основная статья: Стереофотография
Схема Стереофотоаппарата

Стереофотоаппаратфотоаппарат для получения стереопар, снятых двумя объективами со стандартным базисным расстоянием 65 мм, для стереоскопического воспроизведения объекта.

В настоящее время стереофотография начинает заново развиваться. Интерес к ней спустя более 40 лет лет начал вновь увеличиваться в связи с масовым ростом фотолюбителей и бурным развитием цифровой фотографии, а также повышенным спросом в науке и медицине. Появление цифровых стереофотоаппаратов для массового пользователя не случаен.

История[править | править код]

Первая стереокамера 1947 года - Stereo Realist

В 1929 году Seton Rochwite начал проектировать и изготавливать собственные стереокамеры. С 1938 года он начал готовить опытные образцы для коммерческого изготовления. В 1940 глду он создал первый опытный образец. Компания David White Милуоки приняла проект и с 1947 года компания David White успешно начала производство стереофотоаппаратов «Stereo Realist» Сетона Рохвите, имевшие большой спрос. К концу 1960-ых годов из-за сложности рассматривания изображений стереофотография быстро стала терять позиции и фактически производство стереофотокамер прекратилось.[1]

Виды стереофотоаппаратов[править | править код]

Стереофотоаппарат Fujifilm CellNews
Плёночный стерофотооппарат TL120-1

По своей конструкции стереофотокамеры ничем не отличаются от обычных фотоаппаратов. Спаренная оптика и протяжной механизм фотоплёнки определяют специфику конструкции. Стереокамера устроена так, что после каждого одновременного эспонироавния стереопары, перевод плёнки происходит также по два кадра. Настройка стереофотоаппаратов по всем режимам синхронная. Как правило фотообъективы широкоугольные. Это связано с тем, что стереофотография с пространственной передачей изображения, выигривает при просмотре, когда обеспечена более высокая глубина резкости. (Чем объектив более широкоугольный, тем выше у него глубина резкости). Во-вторых, широкоугольный объектив при сьёмках даёт больший охват сюжета, что важно для получения стереоэффета на большей глубине. Величина получения стереэффекта возможна примерно до 11 метров.

Стереофотоаппараты сейчас можно разделить на:

  • Плёночные,
  • Цифровые.

Серийное производство стереофотоаппаратов вновь начато. Так в этом году фирмой Fujifilm начато серийное производство цифровых стереокамер Fujifilm CellNews. Стереоскопический фотоаппарат по своей конструкции ничем не отличается от обычных. У них два объектива с базовым расстоянием как у всех предшественников, но вместо фотоплёнки применены фотосенсоры.

Компания 3D World(Китай) выпустила серийный стереофотоаппарат TL120-1, работающий на среднеформатной плёнке формата 120. Он позволяет вести съёки в двух режимах. Это стереосъёмка и съёмка в режиме одним фотообъективом.

Таблица зачений базисов стереофотосъёмки[править | править код]

Величина базиса стереофотосъемки, см Зона оптимально воспринимаемого пространства, м Граница еще хорошо воспринимаемого пространства, м
6,5 3,0 — 11 22
10 5,0 — 17 34
15 7,5 — 24 51
20 10 — 33 68
30 15 — 51 102

— Величина базиса — это расстояие между осями объективов или передвижка однообъктивной камеры в плоскости фотографирования.

Способы получения стереоснимков[править | править код]

При нормальной стереофотографии базиз фотографирования принимается примерно ≈65 мм (базиз расположения зрачков глаз человека). При этом съёмка ближнего объекта начинается с 400 мм. Откуда, при съёмке весьма удалённых объектов (более 11 метров) базиз съёмки растёт и наоборот, при макросъёмках — уменьшается. Мы таким образом имеем четыре переменных:

  • B - 65 мм (базис глаз);
  • L - расстояние до снимаемого объекта;
  • Bo - базис стереомфотосъёмки (базис объективов);
  • Lo - расстояние до снимаемого объекта;
Общая формула:

$${B \over L} = {Bo \over Lo}\,$$

Например, B - 65 мм (базис глаз) равен: $$B=\frac {LBo}{Lo}\,$$ Откуда находятся любые нужные параметы (варианты стереосъёмок).

Методы получения стереофотоснимков:
  • Случайные стереосъёмки;
  • Нормальные;
  • Стереосъёмки крупным планом;
  • Стереосъёмки в макрофотографии;
  • Съёмки с увеличеннфым фотоэффектом.

См. также[править | править код]

Ссылки[править | править код]